[PHP] Class tổng hợp các thông tin ngày dương, ngày âm, chuyển đổi ngày âm

Chào các bạn!

Sau một thời gian tìm hiểu, mình đã tổng hợp được các thông tin có thể tính toán được từ một ngày dương xác định nào đó (Ví dụ: ngày 29/06/2016).

Các thông tin tính toán được bao gồm:

Ngày dương đầu vào (input_duong)
Ngày âm đầu ra
Tên thứ tiếng Anh
Tên thứ tiếng Việt
Tên tháng âm
Tháng âm nhuận không?
Tháng âm đủ hay thiếu?
Năm dương nhuận không?
Năm âm nhuận không?
Tên năm theo can chi
Tên tháng theo can chi
Tên ngày theo can chi
Tên giờ theo can chi
Tên tiết khí (mùa)
Là ngày lễ tết hay ngày thường?
Giờ hoàng đạo
Thời gian mặt trời
1. Giờ mọc
2. Đứng bóng
3. Giờ lặn
4. Độ dài ban ngày
Thời gian mặt trăng
1. Giờ mọc
2. Giờ lặn
3. Độ dài ban đêm
4. Pha mặt trăng
Chu kỳ mặt trăng
1. Tỷ lệ chiếu sáng
2. Tuổi trăng
3. Khoảng cách đến trái đất
4. Khoảng cách đến mặt trời
5. Ngày trăng non (ngày mồng 1 của tháng)
6. Ngày trăng tròn
7. Ngày trăng non tiếp theo
8. Ngày trăng tròn tiếp theo

Code tham khảo:

<br />
<?php</p>
<p>/**<br />
 * Created by PhpStorm.<br />
 * User: DCV<br />
 * Date: 18/06/2016<br />
 * Time: 6:17 SA<br />
 */<br />
class SunClass<br />
{<br />
    //——————————————— THE SUN INFO —————————————————–<br />
    private static function jdFromDate($dd, $mm, $yy)<br />
    {<br />
        $a = floor((14 – $mm) / 12);<br />
        $y = $yy + 4800 – $a;<br />
        $m = $mm + 12 * $a – 3;<br />
        $jd = $dd + floor((153 * $m + 2) / 5) + 365 * $y + floor($y / 4) – floor($y / 100) + floor($y / 400) – 32045;<br />
        if ($jd < 2299161) {<br />
            $jd = $dd + floor((153 * $m + 2) / 5) + 365 * $y + floor($y / 4) – 32083;<br />
        }<br />
        return $jd;<br />
    }</p>
<p>    private static function jdToDate($jd)<br />
    {<br />
        if ($jd > 2299160) { // After 5/10/1582, Gregorian calendar<br />
            $a = $jd + 32044;<br />
            $b = floor((4 * $a + 3) / 146097);<br />
            $c = $a – floor(($b * 146097) / 4);<br />
        } else {<br />
            $b = 0;<br />
            $c = $jd + 32082;<br />
        }<br />
        $d = floor((4 * $c + 3) / 1461);<br />
        $e = $c – floor((1461 * $d) / 4);<br />
        $m = floor((5 * $e + 2) / 153);<br />
        $day = $e – floor((153 * $m + 2) / 5) + 1;<br />
        $month = $m + 3 – 12 * floor($m / 10);<br />
        $year = $b * 100 + $d – 4800 + floor($m / 10);<br />
        //echo “day = $day, month = $month, year = $yearn”;<br />
        return array($day, $month, $year);<br />
    }</p>
<p>    private static function getNewMoonDay($k, $timeZone)<br />
    {<br />
        $T = $k / 1236.85; // Time in Julian centuries from 1900 January 0.5<br />
        $T2 = $T * $T;<br />
        $T3 = $T2 * $T;<br />
        $dr = M_PI / 180;<br />
        $Jd1 = 2415020.75933 + 29.53058868 * $k + 0.0001178 * $T2 – 0.000000155 * $T3;<br />
        $Jd1 = $Jd1 + 0.00033 * sin((166.56 + 132.87 * $T – 0.009173 * $T2) * $dr); // Mean new moon<br />
        $M = 359.2242 + 29.10535608 * $k – 0.0000333 * $T2 – 0.00000347 * $T3; // Sun’s mean anomaly<br />
        $Mpr = 306.0253 + 385.81691806 * $k + 0.0107306 * $T2 + 0.00001236 * $T3; // Moon’s mean anomaly<br />
        $F = 21.2964 + 390.67050646 * $k – 0.0016528 * $T2 – 0.00000239 * $T3; // Moon’s argument of latitude<br />
        $C1 = (0.1734 – 0.000393 * $T) * sin($M * $dr) + 0.0021 * sin(2 * $dr * $M);<br />
        $C1 = $C1 – 0.4068 * sin($Mpr * $dr) + 0.0161 * sin($dr * 2 * $Mpr);<br />
        $C1 = $C1 – 0.0004 * sin($dr * 3 * $Mpr);<br />
        $C1 = $C1 + 0.0104 * sin($dr * 2 * $F) – 0.0051 * sin($dr * ($M + $Mpr));<br />
        $C1 = $C1 – 0.0074 * sin($dr * ($M – $Mpr)) + 0.0004 * sin($dr * (2 * $F + $M));<br />
        $C1 = $C1 – 0.0004 * sin($dr * (2 * $F – $M)) – 0.0006 * sin($dr * (2 * $F + $Mpr));<br />
        $C1 = $C1 + 0.0010 * sin($dr * (2 * $F – $Mpr)) + 0.0005 * sin($dr * (2 * $Mpr + $M));<br />
        if ($T < -11) {<br />
            $deltat = 0.001 + 0.000839 * $T + 0.0002261 * $T2 – 0.00000845 * $T3 – 0.000000081 * $T * $T3;<br />
        } else {<br />
            $deltat = -0.000278 + 0.000265 * $T + 0.000262 * $T2;<br />
        };<br />
        $JdNew = $Jd1 + $C1 – $deltat;<br />
        //echo “JdNew = $JdNewn”;<br />
        return floor($JdNew + 0.5 + $timeZone / 24);<br />
    }</p>
<p>    private static function getSunLongitude($jdn, $timeZone)<br />
    {<br />
        $T = ($jdn – 2451545.5 – $timeZone / 24) / 36525; // Time in Julian centuries from 2000-01-01 12:00:00 GMT<br />
        $T2 = $T * $T;<br />
        $dr = M_PI / 180; // degree to radian<br />
        $M = 357.52910 + 35999.05030 * $T – 0.0001559 * $T2 – 0.00000048 * $T * $T2; // mean anomaly, degree<br />
        $L0 = 280.46645 + 36000.76983 * $T + 0.0003032 * $T2; // mean longitude, degree<br />
        $DL = (1.914600 – 0.004817 * $T – 0.000014 * $T2) * sin($dr * $M);<br />
        $DL = $DL + (0.019993 – 0.000101 * $T) * sin($dr * 2 * $M) + 0.000290 * sin($dr * 3 * $M);<br />
        $L = $L0 + $DL; // true longitude, degree<br />
        //echo “ndr = $dr, M = $M, T = $T, DL = $DL, L = $L, L0 = $L0n”;<br />
        // obtain apparent longitude by correcting for nutation and aberration<br />
        $omega = 125.04 – 1934.136 * $T;<br />
        $L = $L – 0.00569 – 0.00478 * sin($omega * $dr);<br />
        $L = $L * $dr;<br />
        $L = $L – M_PI * 2 * (floor($L / (M_PI * 2))); // Normalize to (0, 2*PI)<br />
        return floor($L / M_PI * 6);<br />
    }</p>
<p>    private static function getSunLongitude2($jdn)<br />
    {<br />
        //var T, T2, dr, M, L0, DL, lambda, theta, omega;<br />
        $T = ($jdn – 2451545.0) / 36525; // Time in Julian centuries from 2000-01-01 12:00:00 GMT<br />
        $T2 = $T * $T;<br />
        $dr = pi() / 180; // degree to radian<br />
        $M = 357.52910 + 35999.05030 * $T – 0.0001559 * $T2 – 0.00000048 * $T * $T2; // mean anomaly, degree<br />
        $L0 = 280.46645 + 36000.76983 * $T + 0.0003032 * $T2; // mean longitude, degree<br />
        $DL = (1.914600 – 0.004817 * $T – 0.000014 * $T2) * sin($dr * $M);<br />
        $DL = $DL + (0.019993 – 0.000101 * $T) * sin($dr * 2 * $M) + 0.000290 * sin($dr * 3 * $M);<br />
        $theta = $L0 + $DL; // true longitude, degree<br />
        // obtain apparent longitude by correcting for nutation and aberration<br />
        $omega = 125.04 – 1934.136 * $T;<br />
        $lambda = $theta – 0.00569 – 0.00478 * sin($omega * $dr);<br />
        // Convert to radians<br />
        $lambda = $lambda * $dr;<br />
        $lambda = $lambda – pi() * 2 * (floor($lambda / (pi() * 2))); // Normalize to (0, 2*PI)<br />
        return $lambda;<br />
    }</p>
<p>    private static function getLunarMonth11($yy, $timeZone)<br />
    {<br />
        $off = self::jdFromDate(31, 12, $yy) – 2415021;<br />
        $k = floor($off / 29.530588853);<br />
        $nm = self::getNewMoonDay($k, $timeZone);<br />
        $sunLong = self::getSunLongitude($nm, $timeZone); // sun longitude at local midnight<br />
        if ($sunLong >= 9) {<br />
            $nm = self::getNewMoonDay($k – 1, $timeZone);<br />
        }<br />
        return $nm;<br />
    }</p>
<p>    private static function getLeapMonthOffset($a11, $timeZone)<br />
    {<br />
        $k = floor(($a11 – 2415021.076998695) / 29.530588853 + 0.5);<br />
        $last = 0;<br />
        $i = 1; // We start with the month following lunar month 11<br />
        $arc = self::getSunLongitude(self::getNewMoonDay($k + $i, $timeZone), $timeZone);<br />
        do {<br />
            $last = $arc;<br />
            $i = $i + 1;<br />
            $arc = self::getSunLongitude(self::getNewMoonDay($k + $i, $timeZone), $timeZone);<br />
        } while ($arc != $last && $i < 14);<br />
        return $i – 1;<br />
    }</p>
<p>    /**<br />
     * Kiểm tra xem năm dương có nhuận không?<br />
     * @param null $yyyy<br />
     * @return string<br />
     */<br />
    private static function isSolarYearLeap($yyyy = null)<br />
    {<br />
        if ($yyyy == null) {<br />
            $yyyy = date(‘Y’);<br />
        }<br />
        if ($yyyy % 4 == 0 || ($yyyy % 100 == 0 && $yyyy % 400 == 0)) {<br />
            return ‘Năm dương nhuận’;<br />
        } else {<br />
            return ‘Năm dương không nhuận’;<br />
        }<br />
    }</p>
<p>    /**<br />
     * Kiểm tra xem năm âm tương ứng có nhuận không?<br />
     * @param null $yyyy<br />
     * @return string<br />
     */<br />
    private static function isLunarYearLeap($yyyy = null)<br />
    {<br />
        if ($yyyy == null) {<br />
            $yyyy = date(‘Y’);<br />
        }<br />
        $arr = array(0, 3, 6, 9, 11, 14, 17);<br />
        $leap = $yyyy % 19;<br />
        if (in_array($leap, $arr)) {<br />
            return ‘Năm âm nhuận’;<br />
        } else {<br />
            return ‘Năm âm không nhuận’;<br />
        }<br />
    }</p>
<p>    private static function getDayName($id)<br />
    {<br />
        $arr = array(<br />
            ‘Sunday’ => ‘Chủ nhật’,<br />
            ‘Monday’ => ‘Thứ 2’,<br />
            ‘Tuesday’ => ‘Thứ 3’,<br />
            ‘Wednesday’ => ‘Thứ 4’,<br />
            ‘Thursday’ => ‘Thứ 5’,<br />
            ‘Friday’ => ‘Thứ 6’,<br />
            ‘Saturday’ => ‘Thứ 7’<br />
        );<br />
        if (array_key_exists($id, $arr)) {<br />
            return $arr[$id];<br />
        } else {<br />
            return ”;<br />
        }<br />
    }</p>
<p>    private static function getMonthName($id)<br />
    {<br />
        $arr2 = array(‘Tháng Giêng’, ‘Tháng Hai’, ‘Tháng Ba’, ‘Tháng Tư’, ‘Tháng Năm’, ‘Tháng Sáu’, ‘Tháng Bảy’, ‘Tháng Tám’, ‘Tháng Chín’, ‘Tháng Mười’, ‘Tháng Mười Một’, ‘Tháng Chạp’);<br />
        return $arr2[$id];<br />
    }</p>
<p>    private static function getListCan()<br />
    {<br />
        return array(‘Giáp’, ‘Ất’, ‘Bính’, ‘Đinh’, ‘Mậu’, ‘Kỷ’, ‘Canh’, ‘Tân’, ‘Nhâm’, ‘Quí’);<br />
    }</p>
<p>    private static function getListChi()<br />
    {<br />
        return array(‘Tý’, ‘Sửu’, ‘Dần’, ‘Mão’, ‘Thìn’, ‘Tỵ’, ‘Ngọ’, ‘Mùi’, ‘Thân’, ‘Dậu’, ‘Tuất’, ‘Hợi’);<br />
    }</p>
<p>    private static function getCanChiNam($nam)<br />
    {<br />
        $arrCan = self::getListCan();<br />
        $arrChi = self::getListChi();<br />
        $can = ($nam + 6) % 10;<br />
        $chi = ($nam + 8) % 12;<br />
        return ‘Năm ‘ . $arrCan[$can] . ‘ ‘ . $arrChi[$chi];<br />
    }</p>
<p>    private static function getCanChiThang($nam, $thang)<br />
    {<br />
        $arrCan = self::getListCan();<br />
        $arrChi = self::getListChi();<br />
        $can = ($nam * 12 + $thang + 3) % 10;<br />
        $chi = ($thang + 1) % 12;<br />
        return ‘Tháng ‘ . $arrCan[$can] . ‘ ‘ . $arrChi[$chi];<br />
    }</p>
<p>    private static function getCanChiNgay($jd)<br />
    {<br />
        $arrCan = self::getListCan();<br />
        $arrChi = self::getListChi();<br />
        $can = ($jd + 9) % 10;<br />
        $chi = ($jd + 1) % 12;<br />
        return ‘Ngày ‘ . $arrCan[$can] . ‘ ‘ . $arrChi[$chi];<br />
    }</p>
<p>    private static function getCanChiGio($jd)<br />
    {<br />
        $arrCan = self::getListCan();<br />
        $arrChi = self::getListChi();<br />
        $can = ($jd – 1) * 2 % 10;<br />
        return ‘Giờ ‘ . $arrCan[$can] . ‘ ‘ . $arrChi[0];<br />
    }</p>
<p>    private static function getTietKhi($jd)<br />
    {<br />
        $arr = array(<br />
            ‘Xuân phân’, ‘Thanh minh’, ‘Cốc vũ’, ‘Lập hạ’, ‘Tiểu mãn’, ‘Mang chủng’,<br />
            ‘Hạ chí’, ‘Tiểu thử’, ‘Đại thử’, ‘Lập thu’, ‘Xử thử’, ‘Bạch lộ’,<br />
            ‘Thu phân’, ‘Hàn lộ’, ‘Sương giáng’, ‘Lập đông’, ‘Tiểu tuyết’, ‘Đại tuyết’,<br />
            ‘Đông chí’, ‘Tiểu hàn’, ‘Đại hàn’, ‘Lập xuân’, ‘Vũ thủy’, ‘Kinh trập’<br />
        );<br />
        $tietkhi = floor(self::getSunLongitude2($jd + 1 – 0.5 – 7.0 / 24.0) / pi() * 12);<br />
        return $arr[$tietkhi];<br />
    }</p>
<p>    private static function getHoangDao($id)<br />
    {<br />
        $arr = array(“110100101100”, “001101001011”, “110011010010”, “101100110100”, “001011001101”, “010010110011”);<br />
        return $arr[$id];<br />
    }</p>
<p>    private static function getGioHoangDao($jd)<br />
    {<br />
        $chiOfDay = ($jd + 1) % 12;<br />
        $gioHD = self::getHoangDao($chiOfDay % 6); // same values for Ty’ (1) and Ngo. (6), for Suu and Mui etc.<br />
        $ret = “”;<br />
        $count = 0;<br />
        for ($i = 0; $i < 12; $i++) {<br />
            $s = substr($gioHD, $i, 1);<br />
            if ($s == ‘1’) {<br />
                $ret .= self::getListChi()[$i];<br />
                $ret .= ‘ (‘ . (($i * 2 + 23) % 24) . ‘-‘ . (($i * 2 + 1) % 24) . ‘)’;<br />
                if ($count++ < 5) $ret .= ‘, ‘;<br />
                //if (count == 3) ret += ‘n’;<br />
            }<br />
        }<br />
        return $ret;<br />
    }</p>
<p>    private static function getSuKienNam($da, $ma)<br />
    {<br />
        $arr = array(<br />
            ‘1_1’ => ‘Tết Nguyên Đán’,<br />
            ’15_1′ => ‘Rằm Tháng Giêng’,<br />
            ’10_3′ => ‘Giỗ Tổ Hùng Vương’,<br />
            ’15_4′ => ‘Lễ Phật Đản’,<br />
            ‘5_5’ => ‘Tết Đoan Ngọ’,<br />
            ’15_7′ => ‘Lễ Vu Lan’,<br />
            ’15_8′ => ‘Tết Trung Thu’,<br />
            ’23_12′ => ‘Ông Táo chầu trời’<br />
        );</p>
<p>        if (array_key_exists($da . ‘_’ . $ma, $arr)) {<br />
            return $arr[$da . ‘_’ . $ma];<br />
        } else {<br />
            return ‘Ngày thường’;<br />
        }<br />
    }</p>
<p>    private static function getDateSunInfo($dd, $mm, $yy)<br />
    {<br />
        return date_sun_info(strtotime($yy . ‘-‘ . $mm . ‘-‘ . $dd), 21.03, 105.85);<br />
    }</p>
<p>    private static function getNewMoon($dd, $mm, $yy){<br />
        $k = floor((self::jdFromDate($dd, $mm, $yy) – 2415021) / 29.530588853);<br />
        $j = self::getNewMoonDay($k, 7.0);<br />
        $arrDate = self::jdToDate($j);<br />
        //<br />
        $preDate = mktime(0, 0, 0, $arrDate[1], $arrDate[0] – 1, $arrDate[2]);<br />
        return date(‘d/m/Y’, $preDate);<br />
    }</p>
<p>    private static function getEndOfMoon($timestamp){<br />
        $synmonth = 29.53058868;<br />
        $arrPhase = self::phasehunt($timestamp, $synmonth);<br />
        $next_new_moon = $arrPhase[4];<br />
        $preDate = mktime(0, 0, 0, date(‘m’, $next_new_moon), date(‘d’, $next_new_moon) – 1, date(‘Y’, $next_new_moon));<br />
        $preDate = self::convertSolar2Lunar(date(‘d’, $preDate), date(‘m’, $preDate), date(‘Y’, $preDate));<br />
        if(is_numeric($preDate)){<br />
            return date(‘d’, $preDate);<br />
        }else{<br />
            return null;<br />
        }<br />
    }</p>
<p>    /* Comvert solar date dd/mm/yyyy to the corresponding lunar date */<br />
    public static function getArrayDateInfo($dd, $mm, $yy, $timeZone = 7.0)<br />
    {<br />
        $dayNumber = self::jdFromDate($dd, $mm, $yy);<br />
        $k = floor(($dayNumber – 2415021.076998695) / 29.530588853);<br />
        $monthStart = self::getNewMoonDay($k + 1, $timeZone);<br />
        if ($monthStart > $dayNumber) {<br />
            $monthStart = self::getNewMoonDay($k, $timeZone);<br />
        }<br />
        $a11 = self::getLunarMonth11($yy, $timeZone);<br />
        $b11 = $a11;<br />
        if ($a11 >= $monthStart) {<br />
            $lunarYear = $yy;<br />
            $a11 = self::getLunarMonth11($yy – 1, $timeZone);<br />
        } else {<br />
            $lunarYear = $yy + 1;<br />
            $b11 = self::getLunarMonth11($yy + 1, $timeZone);<br />
        }<br />
        $lunarDay = $dayNumber – $monthStart + 1;<br />
        $diff = floor(($monthStart – $a11) / 29);<br />
        $lunarLeap = 0;<br />
        $lunarMonth = $diff + 11;<br />
        if ($b11 – $a11 > 365) {<br />
            $leapMonthDiff = self::getLeapMonthOffset($a11, $timeZone);<br />
            if ($diff >= $leapMonthDiff) {<br />
                $lunarMonth = $diff + 10;<br />
                if ($diff == $leapMonthDiff) {<br />
                    $lunarLeap = 1;<br />
                }<br />
            }<br />
        }<br />
        if ($lunarMonth > 12) {<br />
            $lunarMonth = $lunarMonth – 12;<br />
        }<br />
        if ($lunarMonth >= 11 && $diff < 4) {<br />
            $lunarYear -= 1;<br />
        }</p>
<p>        //<br />
        $intDate = strtotime($yy . ‘-‘ . $mm . ‘-‘ . $dd);<br />
        $dateSunInfo = self::getDateSunInfo($dd, $mm, $yy);<br />
        $nhuan = ($lunarLeap == 1) ? ‘Nhuận’ : ‘Không’;<br />
        $tenthang = (self::getEndOfMoon($intDate) == 30 ? ‘Đủ’ : ‘Thiếu’);<br />
        $moon = self::getMoonTimes($dd, $mm, $yy, 21.03, 105.85);</p>
<p>        return array(<br />
            ‘input_duong’ => date(‘Y-m-d’, $intDate),<br />
            ‘output_am’ => date(‘Y-m-d’, strtotime($lunarYear . ‘-‘ . $lunarMonth . ‘-‘ . $lunarDay)),<br />
            //’lunarLeap’ => $lunarLeap,<br />
            ‘thu_en’ => date(‘l’, $intDate),<br />
            ‘thu_vi’ => self::getDayName(date(‘l’, $intDate)),<br />
            ‘thang_am’ => self::getMonthName($lunarMonth – 1),<br />
            ‘thang_am_nhuan’ => $nhuan,<br />
            ‘thang_am_du_thieu’ => $tenthang,<br />
            ‘nam_duong_nhuan’ => self::isSolarYearLeap($yy),<br />
            ‘nam_am_nhuan’ => self::isLunarYearLeap($yy),<br />
            ‘can_chi_nam’ => self::getCanChiNam($lunarYear),<br />
            ‘can_chi_thang’ => self::getCanChiThang($lunarYear, $lunarMonth),<br />
            ‘can_chi_ngay’ => self::getCanChiNgay(self::jdFromDate($dd, $mm, $yy)),<br />
            ‘can_chi_gio’ => self::getCanChiGio(self::jdFromDate($dd, $mm, $yy)),<br />
            ‘tiet_khi’ => self::getTietKhi(self::jdFromDate($dd, $mm, $yy)),<br />
            ‘day_info’ => self::getSuKienNam($lunarDay, $lunarMonth),<br />
            ‘hoang_dao’ => self::getGioHoangDao(self::jdFromDate($dd, $mm, $yy)),<br />
            ‘sun_info’ => array(<br />
                ‘sunrise’ => date(‘H:i:s’, $dateSunInfo[‘sunrise’]),<br />
                ‘transit’ => date(‘H:i:s’, $dateSunInfo[‘transit’]),<br />
                ‘sunset’ => date(‘H:i:s’, $dateSunInfo[‘sunset’]),<br />
                ‘sun_length’ => gmdate(‘H:i:s’, $dateSunInfo[‘sunset’] – $dateSunInfo[‘sunrise’]),<br />
                //’chang_vang_1′ => date(‘H:i:s’, $dateSunInfo[‘civil_twilight_begin’]),<br />
                //’chang_vang_2′ => date(‘H:i:s’, $dateSunInfo[‘civil_twilight_end’]),<br />
                //’chang_vang_hang_hai_1′ => date(‘H:i:s’, $dateSunInfo[‘nautical_twilight_begin’]),<br />
                //’chang_vang_hang_hai_2′ => date(‘H:i:s’, $dateSunInfo[‘nautical_twilight_end’]),<br />
                //’chang_vang_thien_van_1′ => date(‘H:i:s’, $dateSunInfo[‘astronomical_twilight_begin’]),<br />
                //’chang_vang_thien_van_2′ => date(‘H:i:s’, $dateSunInfo[‘astronomical_twilight_end’])<br />
            ),<br />
            ‘moon_info’ => array(<br />
                ‘moonrise’ => date(‘H:i:s’, $moon[‘moonrise’]),<br />
                ‘moonset’ => date(‘H:i:s’, $moon[‘moonset’]),<br />
                ‘moon_lenght’ => gmdate(‘H:i:s’, $moon[‘moonset’] – $moon[‘moonrise’]),<br />
                ‘moon_phase’ => self::getMoonPhase($dd, $mm, $yy)<br />
            ),<br />
            ‘moon_cycle’ => self::getMoonCycle($intDate)<br />
        );<br />
    }</p>
<p>    public static function convertSolar2Lunar($dd, $mm, $yy, $timeZone = 7.0)<br />
    {<br />
        $dayNumber = self::jdFromDate($dd, $mm, $yy);<br />
        $k = floor(($dayNumber – 2415021.076998695) / 29.530588853);<br />
        $monthStart = self::getNewMoonDay($k + 1, $timeZone);<br />
        if ($monthStart > $dayNumber) {<br />
            $monthStart = self::getNewMoonDay($k, $timeZone);<br />
        }<br />
        $a11 = self::getLunarMonth11($yy, $timeZone);<br />
        $b11 = $a11;<br />
        if ($a11 >= $monthStart) {<br />
            $lunarYear = $yy;<br />
            $a11 = self::getLunarMonth11($yy – 1, $timeZone);<br />
        } else {<br />
            $lunarYear = $yy + 1;<br />
            $b11 = self::getLunarMonth11($yy + 1, $timeZone);<br />
        }<br />
        $lunarDay = $dayNumber – $monthStart + 1;<br />
        $diff = floor(($monthStart – $a11) / 29);<br />
        $lunarLeap = 0;<br />
        $lunarMonth = $diff + 11;<br />
        if ($b11 – $a11 > 365) {<br />
            $leapMonthDiff = self::getLeapMonthOffset($a11, $timeZone);<br />
            if ($diff >= $leapMonthDiff) {<br />
                $lunarMonth = $diff + 10;<br />
                if ($diff == $leapMonthDiff) {<br />
                    $lunarLeap = 1;<br />
                }<br />
            }<br />
        }<br />
        if ($lunarMonth > 12) {<br />
            $lunarMonth = $lunarMonth – 12;<br />
        }<br />
        if ($lunarMonth >= 11 && $diff < 4) {<br />
            $lunarYear -= 1;<br />
        }</p>
<p>        return strtotime($lunarYear . ‘-‘ . $lunarMonth . ‘-‘ . $lunarDay);<br />
    }</p>
<p>    /* Convert a lunar date to the corresponding solar date */<br />
    public static function convertLunar2Solar($lunarDay, $lunarMonth, $lunarYear, $lunarLeap, $timeZone = 7.0)<br />
    {<br />
        if ($lunarMonth < 11) {<br />
            $a11 = self::getLunarMonth11($lunarYear – 1, $timeZone);<br />
            $b11 = self::getLunarMonth11($lunarYear, $timeZone);<br />
        } else {<br />
            $a11 = self::getLunarMonth11($lunarYear, $timeZone);<br />
            $b11 = self::getLunarMonth11($lunarYear + 1, $timeZone);<br />
        }<br />
        $k = floor(0.5 + ($a11 – 2415021.076998695) / 29.530588853);<br />
        $off = $lunarMonth – 11;<br />
        if ($off < 0) {<br />
            $off += 12;<br />
        }<br />
        if ($b11 – $a11 > 365) {<br />
            $leapOff = self::getLeapMonthOffset($a11, $timeZone);<br />
            $leapMonth = $leapOff – 2;<br />
            if ($leapMonth < 0) {<br />
                $leapMonth += 12;<br />
            }<br />
            if ($lunarLeap != 0 && $lunarMonth != $leapMonth) {<br />
                return array(0, 0, 0);<br />
            } else if ($lunarLeap != 0 || $off >= $leapOff) {<br />
                $off += 1;<br />
            }<br />
        }<br />
        $monthStart = self::getNewMoonDay($k + $off, $timeZone);<br />
        return self::jdToDate($monthStart + $lunarDay – 1);<br />
    }</p>
<p>    //——————————————— THE MOON INFO —————————————————–<br />
    /**<br />
     * Calculates the moon rise/set for a given location and day of year<br />
     */<br />
    public static function getMoonTimes($day, $month, $year, $lat, $lon)<br />
    {<br />
        $utrise = $utset = 0;<br />
        $timezone = (int)($lon / 15);<br />
        $date = self::modifiedJulianDate($month, $day, $year);<br />
        $date -= $timezone / 24;<br />
        $latRad = deg2rad($lat);<br />
        $sinho = 0.0023271056;<br />
        $sglat = sin($latRad);<br />
        $cglat = cos($latRad);</p>
<p>        $rise = false;<br />
        $set = false;<br />
        $above = false;<br />
        $hour = 1;<br />
        $ym = self::sinAlt($date, $hour – 1, $lon, $cglat, $sglat) – $sinho;</p>
<p>        $above = $ym > 0;<br />
        while ($hour < 25 && (false == $set || false == $rise)) {<br />
            $yz = self::sinAlt($date, $hour, $lon, $cglat, $sglat) – $sinho;<br />
            $yp = self::sinAlt($date, $hour + 1, $lon, $cglat, $sglat) – $sinho;</p>
<p>            $quadout = self::quad($ym, $yz, $yp);<br />
            $nz = $quadout[0];<br />
            $z1 = $quadout[1];<br />
            $z2 = $quadout[2];<br />
            $xe = $quadout[3];<br />
            $ye = $quadout[4];</p>
<p>            if ($nz == 1) {<br />
                if ($ym < 0) {<br />
                    $utrise = $hour + $z1;<br />
                    $rise = true;<br />
                } else {<br />
                    $utset = $hour + $z1;<br />
                    $set = true;<br />
                }<br />
            }</p>
<p>            if ($nz == 2) {<br />
                if ($ye < 0) {<br />
                    $utrise = $hour + $z2;<br />
                    $utset = $hour + $z1;<br />
                } else {<br />
                    $utrise = $hour + $z1;<br />
                    $utset = $hour + $z2;<br />
                }<br />
            }</p>
<p>            $ym = $yp;<br />
            $hour += 2.0;<br />
        }<br />
        // Convert to unix timestamps and return as an array<br />
        $utrise = self::convertTime($utrise);<br />
        $utset = self::convertTime($utset);<br />
        $moonrise = $rise ? mktime($utrise[‘hrs’], $utrise[‘min’], 0, $month, $day, $year) : mktime(0, 0, 0, $month, $day + 1, $year);<br />
        $moonset = $set ? mktime($utset[‘hrs’], $utset[‘min’], 0, $month, $day, $year) : mktime(0, 0, 0, $month, $day + 1, $year);<br />
        $retVal = array(<br />
            ‘moonrise’ => $moonrise,<br />
            ‘moonset’ => $moonset<br />
        );<br />
        return $retVal;<br />
    }</p>
<p>    /**<br />
     *    finds the parabola throuh the three points (-1,ym), (0,yz), (1, yp)<br />
     *  and returns the coordinates of the max/min (if any) xe, ye<br />
     *  the values of x where the parabola crosses zero (roots of the self::quadratic)<br />
     *  and the number of roots (0, 1 or 2) within the interval [-1, 1]<br />
     *<br />
     *    well, this routine is producing sensible answers<br />
     *<br />
     *  results passed as array [nz, z1, z2, xe, ye]<br />
     */<br />
    private static function quad($ym, $yz, $yp)<br />
    {<br />
        $nz = $z1 = $z2 = 0;<br />
        $a = 0.5 * ($ym + $yp) – $yz;<br />
        $b = 0.5 * ($yp – $ym);<br />
        $c = $yz;<br />
        $xe = -$b / (2 * $a);<br />
        $ye = ($a * $xe + $b) * $xe + $c;<br />
        $dis = $b * $b – 4 * $a * $c;<br />
        if ($dis > 0) {<br />
            $dx = 0.5 * sqrt($dis) / abs($a);<br />
            $z1 = $xe – $dx;<br />
            $z2 = $xe + $dx;<br />
            $nz = abs($z1) < 1 ? $nz + 1 : $nz;<br />
            $nz = abs($z2) < 1 ? $nz + 1 : $nz;<br />
            $z1 = $z1 < -1 ? $z2 : $z1;<br />
        }</p>
<p>        return array($nz, $z1, $z2, $xe, $ye);<br />
    }</p>
<p>    /**<br />
     *    this rather mickey mouse function takes a lot of<br />
     *  arguments and then returns the sine of the altitude of the moon<br />
     */<br />
    private static function sinAlt($mjd, $hour, $glon, $cglat, $sglat)<br />
    {<br />
        $mjd += $hour / 24;<br />
        $t = ($mjd – 51544.5) / 36525;<br />
        $objpos = self::minimoon($t);</p>
<p>        $ra = $objpos[1];<br />
        $dec = $objpos[0];<br />
        $decRad = deg2rad($dec);<br />
        $tau = 15 * (self::lmst($mjd, $glon) – $ra);</p>
<p>        return $sglat * sin($decRad) + $cglat * cos($decRad) * cos(deg2rad($tau));<br />
    }</p>
<p>    /**<br />
     *    returns an angle in degrees in the range 0 to 360<br />
     */<br />
    private static function degRange($x)<br />
    {<br />
        $b = $x / 360;<br />
        $a = 360 * ($b – (int)$b);<br />
        $retVal = $a < 0 ? $a + 360 : $a;<br />
        return $retVal;<br />
    }</p>
<p>    private static function lmst($mjd, $glon)<br />
    {<br />
        $d = $mjd – 51544.5;<br />
        $t = $d / 36525;<br />
        $lst = self::degRange(280.46061839 + 360.98564736629 * $d + 0.000387933 * $t * $t – $t * $t * $t / 38710000);<br />
        return $lst / 15 + $glon / 15;<br />
    }</p>
<p>    /**<br />
     * takes t and returns the geocentric ra and dec in an array mooneq<br />
     * claimed good to 5′ (angle) in ra and 1′ in dec<br />
     * tallies with another approximate method and with ICE for a couple of dates<br />
     */<br />
    private static function minimoon($t)<br />
    {<br />
        $p2 = 6.283185307;<br />
        $arc = 206264.8062;<br />
        $coseps = 0.91748;<br />
        $sineps = 0.39778;</p>
<p>        $lo = self::frac(0.606433 + 1336.855225 * $t);<br />
        $l = $p2 * self::frac(0.374897 + 1325.552410 * $t);<br />
        $l2 = $l * 2;<br />
        $ls = $p2 * self::frac(0.993133 + 99.997361 * $t);<br />
        $d = $p2 * self::frac(0.827361 + 1236.853086 * $t);<br />
        $d2 = $d * 2;<br />
        $f = $p2 * self::frac(0.259086 + 1342.227825 * $t);<br />
        $f2 = $f * 2;</p>
<p>        $sinls = sin($ls);<br />
        $sinf2 = sin($f2);</p>
<p>        $dl = 22640 * sin($l);<br />
        $dl += -4586 * sin($l – $d2);<br />
        $dl += 2370 * sin($d2);<br />
        $dl += 769 * sin($l2);<br />
        $dl += -668 * $sinls;<br />
        $dl += -412 * $sinf2;<br />
        $dl += -212 * sin($l2 – $d2);<br />
        $dl += -206 * sin($l + $ls – $d2);<br />
        $dl += 192 * sin($l + $d2);<br />
        $dl += -165 * sin($ls – $d2);<br />
        $dl += -125 * sin($d);<br />
        $dl += -110 * sin($l + $ls);<br />
        $dl += 148 * sin($l – $ls);<br />
        $dl += -55 * sin($f2 – $d2);</p>
<p>        $s = $f + ($dl + 412 * $sinf2 + 541 * $sinls) / $arc;<br />
        $h = $f – $d2;<br />
        $n = -526 * sin($h);<br />
        $n += 44 * sin($l + $h);<br />
        $n += -31 * sin(-$l + $h);<br />
        $n += -23 * sin($ls + $h);<br />
        $n += 11 * sin(-$ls + $h);<br />
        $n += -25 * sin(-$l2 + $f);<br />
        $n += 21 * sin(-$l + $f);</p>
<p>        $L_moon = $p2 * self::frac($lo + $dl / 1296000);<br />
        $B_moon = (18520.0 * sin($s) + $n) / $arc;</p>
<p>        $cb = cos($B_moon);<br />
        $x = $cb * cos($L_moon);<br />
        $v = $cb * sin($L_moon);<br />
        $w = sin($B_moon);<br />
        $y = $coseps * $v – $sineps * $w;<br />
        $z = $sineps * $v + $coseps * $w;<br />
        $rho = sqrt(1 – $z * $z);<br />
        $dec = (360 / $p2) * atan($z / $rho);<br />
        $ra = (48 / $p2) * atan($y / ($x + $rho));<br />
        $ra = $ra < 0 ? $ra + 24 : $ra;</p>
<p>        return array($dec, $ra);<br />
    }</p>
<p>    /**<br />
     *    returns the self::fractional part of x as used in self::minimoon and minisun<br />
     */<br />
    private static function frac($x)<br />
    {<br />
        $x -= (int)$x;<br />
        return $x < 0 ? $x + 1 : $x;<br />
    }</p>
<p>    /**<br />
     * Takes the day, month, year and hours in the day and returns the<br />
     * modified julian day number defined as mjd = jd – 2400000.5<br />
     * checked OK for Greg era dates – 26th Dec 02<br />
     */<br />
    private static function modifiedJulianDate($month, $day, $year)<br />
    {<br />
        if ($month <= 2) {<br />
            $month += 12;<br />
            $year–;<br />
        }</p>
<p>        $a = 10000 * $year + 100 * $month + $day;<br />
        $b = 0;<br />
        if ($a <= 15821004.1) {<br />
            $b = -2 * (int)(($year + 4716) / 4) – 1179;<br />
        } else {<br />
            $b = (int)($year / 400) – (int)($year / 100) + (int)($year / 4);<br />
        }</p>
<p>        $a = 365 * $year – 679004;<br />
        return $a + $b + (int)(30.6001 * ($month + 1)) + $day;<br />
    }</p>
<p>    /**<br />
     * Converts an hours decimal to hours and minutes<br />
     */<br />
    private static function convertTime($hours)<br />
    {<br />
        $hrs = (int)($hours * 60 + 0.5) / 60.0;<br />
        $h = (int)($hrs);<br />
        $m = (int)(60 * ($hrs – $h) + 0.5);<br />
        return array(‘hrs’ => $h, ‘min’ => $m);<br />
    }</p>
<p>    private static function getMoonPhase($day, $month, $year)<br />
    {<br />
        $date = strtotime($year.’-‘.$month.’-‘.$day);<br />
        // calculate lunar phase (1900 – 2199)<br />
        $year = date(‘Y’, $date);<br />
        $month = date(‘n’, $date);<br />
        $day = date(‘j’, $date);<br />
        if ($month < 4) {<br />
            $year = $year – 1;<br />
            $month = $month + 12;<br />
        }<br />
        $days_y = 365.25 * $year;<br />
        $days_m = 30.42 * $month;<br />
        $julian = $days_y + $days_m + $day – 694039.09;<br />
        $julian = $julian / 29.53;<br />
        $phase = intval($julian);<br />
        $julian = $julian – $phase;<br />
        $phase = round($julian * 8 + 0.5);<br />
        if ($phase == 8) {<br />
            $phase = 0;<br />
        }<br />
        //$phase_array = array(‘new’, ‘waxing crescent’, ‘first quarter’, ‘waxing gibbous’, ‘full’, ‘waning gibbous’, ‘last quarter’, ‘waning crescent’);<br />
        $phase_array = array(<br />
            ‘Trăng mới’,<br />
            ‘Trăng lưỡi liềm đầu tháng’,<br />
            ‘Trăng bán nguyệt đầu tháng’,<br />
            ‘Trăng khuyết đầu tháng’,<br />
            ‘Trăng tròn’,<br />
            ‘Trăng khuyết cuối tháng’,<br />
            ‘Trăng bán nguyệt cuối tháng’,<br />
            ‘Trăng lưỡi liềm cuối tháng’<br />
        );<br />
        return $phase_array[$phase];<br />
    }</p>
<p>    //——————————————— THE MOON INFO —————————————————–<br />
    public static function getMoonCycle( $pdate = null ) {<br />
        if( is_null( $pdate ) )<br />
            $pdate = time();</p>
<p>        /*  Astronomical constants  */<br />
        $epoch = 2444238.5;			// 1980 January 0.0</p>
<p>        /*  Constants defining the Sun’s apparent orbit  */<br />
        $elonge = 278.833540;		// Ecliptic longitude of the Sun at epoch 1980.0<br />
        $elongp = 282.596403;		// Ecliptic longitude of the Sun at perigee<br />
        $eccent = 0.016718;			// Eccentricity of Earth’s orbit<br />
        $sunsmax = 1.495985e8;		// Semi-major axis of Earth’s orbit, km<br />
        $sunangsiz = 0.533128;		// Sun’s angular size, degrees, at semi-major axis distance</p>
<p>        /*  Elements of the Moon’s orbit, epoch 1980.0  */<br />
        $mmlong = 64.975464;		// Moon’s mean longitude at the epoch<br />
        $mmlongp = 349.383063;		// Mean longitude of the perigee at the epoch<br />
        $mlnode = 151.950429;		// Mean longitude of the node at the epoch<br />
        $minc = 5.145396;			// Inclination of the Moon’s orbit<br />
        $mecc = 0.054900;			// Eccentricity of the Moon’s orbit<br />
        $mangsiz = 0.5181;			// Moon’s angular size at distance a from Earth<br />
        $msmax = 384401;			// Semi-major axis of Moon’s orbit in km<br />
        $mparallax = 0.9507;		// Parallax at distance a from Earth<br />
        $synmonth = 29.53058868;	// Synodic month (new Moon to new Moon)<br />
        $lunatbase = 2423436.0;		// Base date for E. W. Brown’s numbered series of lunations (1923 January 16)</p>
<p>        /*  Properties of the Earth  */<br />
        // $earthrad = 6378.16;				// Radius of Earth in kilometres<br />
        // $PI = 3.14159265358979323846;	// Assume not near black hole</p>
<p>        $timestamp = $pdate;<br />
        // pdate is coming in as a UNIX timstamp, so convert it to Julian<br />
        $pdate =  $pdate / 86400 + 2440587.5;</p>
<p>        /* Calculation of the Sun’s position */<br />
        $Day = $pdate – $epoch;								// Date within epoch<br />
        $N = self::fixangle((360 / 365.2422) * $Day);		// Mean anomaly of the Sun<br />
        $M = self::fixangle($N + $elonge – $elongp);		// Convert from perigee co-ordinates to epoch 1980.0<br />
        $Ec = self::kepler($M, $eccent);					// Solve equation of Kepler<br />
        $Ec = sqrt((1 + $eccent) / (1 – $eccent)) * tan($Ec / 2);<br />
        $Ec = 2 * rad2deg(atan($Ec));						// True anomaly<br />
        $Lambdasun = self::fixangle($Ec + $elongp);		// Sun’s geocentric ecliptic longitude</p>
<p>        $F = ((1 + $eccent * cos(deg2rad($Ec))) / (1 – $eccent * $eccent));	// Orbital distance factor<br />
        $SunDist = $sunsmax / $F;							// Distance to Sun in km<br />
        $SunAng = $F * $sunangsiz;							// Sun’s angular size in degrees</p>
<p>        /* Calculation of the Moon’s position */<br />
        $ml = self::fixangle(13.1763966 * $Day + $mmlong);				// Moon’s mean longitude<br />
        $MM = self::fixangle($ml – 0.1114041 * $Day – $mmlongp);		// Moon’s mean anomaly<br />
        $MN = self::fixangle($mlnode – 0.0529539 * $Day);				// Moon’s ascending node mean longitude<br />
        $Ev = 1.2739 * sin(deg2rad(2 * ($ml – $Lambdasun) – $MM));		// Evection<br />
        $Ae = 0.1858 * sin(deg2rad($M));								// Annual equation<br />
        $A3 = 0.37 * sin(deg2rad($M));									// Correction term<br />
        $MmP = $MM + $Ev – $Ae – $A3;									// Corrected anomaly<br />
        $mEc = 6.2886 * sin(deg2rad($MmP));								// Correction for the equation of the centre<br />
        $A4 = 0.214 * sin(deg2rad(2 * $MmP));							// Another correction term<br />
        $lP = $ml + $Ev + $mEc – $Ae + $A4;								// Corrected longitude<br />
        $V = 0.6583 * sin(deg2rad(2 * ($lP – $Lambdasun)));				// Variation<br />
        $lPP = $lP + $V;												// True longitude<br />
        $NP = $MN – 0.16 * sin(deg2rad($M));							// Corrected longitude of the node<br />
        $y = sin(deg2rad($lPP – $NP)) * cos(deg2rad($minc));			// Y inclination coordinate<br />
        $x = cos(deg2rad($lPP – $NP));									// X inclination coordinate</p>
<p>        $Lambdamoon = rad2deg(atan2($y, $x)) + $NP;						// Ecliptic longitude<br />
        $BetaM = rad2deg(asin(sin(deg2rad($lPP – $NP)) * sin(deg2rad($minc))));		// Ecliptic latitude</p>
<p>        /* Calculation of the phase of the Moon */<br />
        $MoonAge = $lPP – $Lambdasun;									// Age of the Moon in degrees<br />
        $MoonPhase = (1 – cos(deg2rad($MoonAge))) / 2;					// Phase of the Moon</p>
<p>        // Distance of moon from the centre of the Earth<br />
        $MoonDist = ($msmax * (1 – $mecc * $mecc)) / (1 + $mecc * cos(deg2rad($MmP + $mEc)));</p>
<p>        $MoonDFrac = $MoonDist / $msmax;<br />
        $MoonAng = $mangsiz / $MoonDFrac;								// Moon’s angular diameter<br />
        // $MoonPar = $mparallax / $MoonDFrac;							// Moon’s parallax</p>
<p>        // store results<br />
        $phase = self::fixangle($MoonAge) / 360;<br />
        $result = array(<br />
            //’phase’ => $phase,<br />
            //’illum’ => $MoonPhase,<br />
            ‘illum_percent’ => round($MoonPhase*100, 2),<br />
            ‘age’ => $synmonth * $phase,<br />
            ‘dist’ => $MoonDist,<br />
            //’angdia’ => $MoonAng,<br />
            ‘sundist’ => $SunDist,<br />
            //’sunangdia’ => $SunAng,<br />
            ‘new_moon’ => self::get_phase(0, $timestamp, $synmonth),<br />
            ‘first_quarter’ => self::get_phase(1, $timestamp, $synmonth),<br />
            ‘full_moon’ => self::get_phase(2, $timestamp, $synmonth),<br />
            ‘last_quarter’ => self::get_phase(3, $timestamp, $synmonth),<br />
            ‘next_new_moon’ => self::get_phase(4, $timestamp, $synmonth),<br />
            ‘next_first_quarter’ => self::get_phase(5, $timestamp, $synmonth),<br />
            ‘next_full_moon’ => self::get_phase(6, $timestamp, $synmonth),<br />
            ‘next_last_quarter’ => self::get_phase(7, $timestamp, $synmonth)<br />
        );<br />
        return $result;<br />
    }</p>
<p>    private static function fixangle($a) {<br />
        return ( $a – 360 * floor($a / 360) );<br />
    }</p>
<p>    //  KEPLER  —   Solve the equation of Kepler.<br />
    private static function kepler($m, $ecc) {<br />
        $epsilon = 0.000001;	// 1E-6<br />
        $e = $m = deg2rad($m);<br />
        do {<br />
            $delta = $e – $ecc * sin($e) – $m;<br />
            $e -= $delta / ( 1 – $ecc * cos($e) );<br />
        }<br />
        while ( abs($delta) > $epsilon );<br />
        return $e;<br />
    }</p>
<p>    /*  Calculates  time  of  the mean new Moon for a given<br />
        base date.  This argument K to this function is the<br />
        precomputed synodic month index, given by:<br />
            K = (year – 1900) * 12.3685<br />
        where year is expressed as a year and fractional year.<br />
    */<br />
    private static function meanphase($sdate, $k, $synmonth){<br />
        // Time in Julian centuries from 1900 January 0.5<br />
        $t = ( $sdate – 2415020.0 ) / 36525;<br />
        $t2 = $t * $t;<br />
        $t3 = $t2 * $t;</p>
<p>        $nt1 = 2415020.75933 + $synmonth * $k<br />
            + 0.0001178 * $t2<br />
            – 0.000000155 * $t3<br />
            + 0.00033 * sin( deg2rad( 166.56 + 132.87 * $t – 0.009173 * $t2 ) );</p>
<p>        return $nt1;<br />
    }</p>
<p>    /*  Given a K value used to determine the mean phase of<br />
        the new moon, and a phase selector (0.0, 0.25, 0.5,<br />
        0.75), obtain the true, corrected phase time.<br />
    */<br />
    private static function truephase($k, $phase, $synmonth){<br />
        $apcor = false;</p>
<p>        $k += $phase;				// Add phase to new moon time<br />
        $t = $k / 1236.85;			// Time in Julian centuries from 1900 January 0.5<br />
        $t2 = $t * $t;				// Square for frequent use<br />
        $t3 = $t2 * $t;				// Cube for frequent use<br />
        $pt = 2415020.75933			// Mean time of phase<br />
            + $synmonth * $k<br />
            + 0.0001178 * $t2<br />
            – 0.000000155 * $t3<br />
            + 0.00033 * sin( deg2rad( 166.56 + 132.87 * $t – 0.009173 * $t2 ) );</p>
<p>        $m = 359.2242 + 29.10535608 * $k – 0.0000333 * $t2 – 0.00000347 * $t3;			// Sun’s mean anomaly<br />
        $mprime = 306.0253 + 385.81691806 * $k + 0.0107306 * $t2 + 0.00001236 * $t3;	// Moon’s mean anomaly<br />
        $f = 21.2964 + 390.67050646 * $k – 0.0016528 * $t2 – 0.00000239 * $t3;			// Moon’s argument of latitude<br />
        if ( $phase < 0.01 || abs( $phase – 0.5 ) < 0.01 ) {<br />
            // Corrections for New and Full Moon<br />
            $pt +=  (0.1734 – 0.000393 * $t) * sin( deg2rad( $m ) )<br />
                + 0.0021 * sin( deg2rad( 2 * $m ) )<br />
                – 0.4068 * sin( deg2rad( $mprime ) )<br />
                + 0.0161 * sin( deg2rad( 2 * $mprime) )<br />
                – 0.0004 * sin( deg2rad( 3 * $mprime ) )<br />
                + 0.0104 * sin( deg2rad( 2 * $f ) )<br />
                – 0.0051 * sin( deg2rad( $m + $mprime ) )<br />
                – 0.0074 * sin( deg2rad( $m – $mprime ) )<br />
                + 0.0004 * sin( deg2rad( 2 * $f + $m ) )<br />
                – 0.0004 * sin( deg2rad( 2 * $f – $m ) )<br />
                – 0.0006 * sin( deg2rad( 2 * $f + $mprime ) )<br />
                + 0.0010 * sin( deg2rad( 2 * $f – $mprime ) )<br />
                + 0.0005 * sin( deg2rad( $m + 2 * $mprime ) );<br />
            $apcor = true;<br />
        } else if ( abs( $phase – 0.25 ) < 0.01 || abs( $phase – 0.75 ) < 0.01 ) {<br />
            $pt +=  (0.1721 – 0.0004 * $t) * sin( deg2rad( $m ) )<br />
                + 0.0021 * sin( deg2rad( 2 * $m ) )<br />
                – 0.6280 * sin( deg2rad( $mprime ) )<br />
                + 0.0089 * sin( deg2rad( 2 * $mprime) )<br />
                – 0.0004 * sin( deg2rad( 3 * $mprime ) )<br />
                + 0.0079 * sin( deg2rad( 2 * $f ) )<br />
                – 0.0119 * sin( deg2rad( $m + $mprime ) )<br />
                – 0.0047 * sin( deg2rad ( $m – $mprime ) )<br />
                + 0.0003 * sin( deg2rad( 2 * $f + $m ) )<br />
                – 0.0004 * sin( deg2rad( 2 * $f – $m ) )<br />
                – 0.0006 * sin( deg2rad( 2 * $f + $mprime ) )<br />
                + 0.0021 * sin( deg2rad( 2 * $f – $mprime ) )<br />
                + 0.0003 * sin( deg2rad( $m + 2 * $mprime ) )<br />
                + 0.0004 * sin( deg2rad( $m – 2 * $mprime ) )<br />
                – 0.0003 * sin( deg2rad( 2 * $m + $mprime ) );<br />
            if ( $phase < 0.5 )		// First quarter correction<br />
                $pt += 0.0028 – 0.0004 * cos( deg2rad( $m ) ) + 0.0003 * cos( deg2rad( $mprime ) );<br />
            else	// Last quarter correction<br />
                $pt += -0.0028 + 0.0004 * cos( deg2rad( $m ) ) – 0.0003 * cos( deg2rad( $mprime ) );<br />
            $apcor = true;<br />
        }<br />
        if (!$apcor)	// function was called with an invalid phase selector<br />
            return false;</p>
<p>        return $pt;<br />
    }</p>
<p>    /* 	Find time of phases of the moon which surround the current date.<br />
        Five phases are found, starting and<br />
        ending with the new moons which bound the  current lunation.<br />
    */<br />
    private static function phasehunt($timestamp, $synmonth) {<br />
        $sdate = self::utctojulian($timestamp );<br />
        $adate = $sdate – 45;<br />
        $ats = $timestamp – 86400 * 45;<br />
        $yy = (int) gmdate( ‘Y’, $ats );<br />
        $mm = (int) gmdate( ‘n’, $ats );</p>
<p>        $k1 = floor( ( $yy + ( ( $mm – 1 ) * ( 1 / 12 ) ) – 1900 ) * 12.3685 );<br />
        $adate = $nt1 = self::meanphase( $adate, $k1, $synmonth);</p>
<p>        while (true) {<br />
            $adate += $synmonth;<br />
            $k2 = $k1 + 1;<br />
            $nt2 = self::meanphase( $adate, $k2, $synmonth);<br />
            // if nt2 is close to sdate, then mean phase isn’t good enough, we have to be more accurate<br />
            if( abs( $nt2 – $sdate ) < 0.75 )<br />
                $nt2 = self::truephase( $k2, 0.0, $synmonth);<br />
            if ( $nt1 <= $sdate && $nt2 > $sdate )<br />
                break;<br />
            $nt1 = $nt2;<br />
            $k1 = $k2;<br />
        }</p>
<p>        // results in Julian dates<br />
        $data = array(<br />
            self::truephase( $k1, 0.0, $synmonth),<br />
            self::truephase( $k1, 0.25, $synmonth),<br />
            self::truephase( $k1, 0.5, $synmonth),<br />
            self::truephase( $k1, 0.75, $synmonth),<br />
            self::truephase( $k2, 0.0, $synmonth),<br />
            self::truephase( $k2, 0.25, $synmonth),<br />
            self::truephase( $k2, 0.5, $synmonth),<br />
            self::truephase( $k2, 0.75, $synmonth)<br />
        );</p>
<p>        $quarters = array();<br />
        foreach( $data as $v ){<br />
            $quarters[] = ( $v – 2440587.5 ) * 86400;	// convert to UNIX time<br />
        }<br />
        return $quarters;<br />
    }</p>
<p>    /*  Convert UNIX timestamp to astronomical Julian time (i.e. Julian date plus day fraction).  */<br />
    private static function utctojulian( $ts ) {<br />
        return $ts / 86400 + 2440587.5;<br />
    }</p>
<p>    private static function get_phase($n, $timestamp, $synmonth ) {<br />
        $arrPhase = self::phasehunt($timestamp, $synmonth);<br />
        return date(‘d/m/Y’, $arrPhase[$n]);<br />
    }<br />
}</p>
<p>echo ‘<meta charset=”UTF-8″>’;<br />
$d = SunClass::getArrayDateInfo(date(‘d’), date(‘m’), date(‘Y’));<br />
echo ‘<pre>’;<br />
print_r($d);<br />
echo ‘</pre>’;

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<?php

/**

* Created by PhpStorm.

* User: DCV

* Date: 18/06/2016

* Time: 6:17 SA

class SunClass

{

//——————————————— THE SUN INFO —————————————————–

private static function jdFromDate($dd, $mm, $yy)

{

$a = floor((14 – $mm) / 12);

$y = $yy + 4800 – $a;

$m = $mm + 12 * $a – 3;

$jd = $dd + floor((153 * $m + 2) / 5) + 365 * $y + floor($y / 4) – floor($y / 100) + floor($y / 400) – 32045;

if ($jd < 2299161) {

$jd = $dd + floor((153 * $m + 2) / 5) + 365 * $y + floor($y / 4) – 32083;

}

return $jd;

}

private static function jdToDate($jd)

{

if ($jd > 2299160) { // After 5/10/1582, Gregorian calendar

$a = $jd + 32044;

$b = floor((4 * $a + 3) / 146097);

$c = $a – floor(($b * 146097) / 4);

} else {

$b = 0;

$c = $jd + 32082;

}

$d = floor((4 * $c + 3) / 1461);

$e = $c – floor((1461 * $d) / 4);

$m = floor((5 * $e + 2) / 153);

$day = $e – floor((153 * $m + 2) / 5) + 1;

$month = $m + 3 – 12 * floor($m / 10);

$year = $b * 100 + $d – 4800 + floor($m / 10);

//echo “day = $day, month = $month, year = $yearn”;

return array($day, $month, $year);

}

private static function getNewMoonDay($k, $timeZone)

{

$T = $k / 1236.85; // Time in Julian centuries from 1900 January 0.5

$T2 = $T * $T;

$T3 = $T2 * $T;

$dr = M_PI / 180;

$Jd1 = 2415020.75933 + 29.53058868 * $k + 0.0001178 * $T2 – 0.000000155 * $T3;

$Jd1 = $Jd1 + 0.00033 * sin((166.56 + 132.87 * $T – 0.009173 * $T2) * $dr); // Mean new moon

$M = 359.2242 + 29.10535608 * $k – 0.0000333 * $T2 – 0.00000347 * $T3; // Sun’s mean anomaly

$Mpr = 306.0253 + 385.81691806 * $k + 0.0107306 * $T2 + 0.00001236 * $T3; // Moon’s mean anomaly

$F = 21.2964 + 390.67050646 * $k – 0.0016528 * $T2 – 0.00000239 * $T3; // Moon’s argument of latitude

$C1 = (0.1734 – 0.000393 * $T) * sin($M * $dr) + 0.0021 * sin(2 * $dr * $M);

$C1 = $C1 – 0.4068 * sin($Mpr * $dr) + 0.0161 * sin($dr * 2 * $Mpr);

$C1 = $C1 – 0.0004 * sin($dr * 3 * $Mpr);

$C1 = $C1 + 0.0104 * sin($dr * 2 * $F) – 0.0051 * sin($dr * ($M + $Mpr));

$C1 = $C1 – 0.0074 * sin($dr * ($M – $Mpr)) + 0.0004 * sin($dr * (2 * $F + $M));

$C1 = $C1 – 0.0004 * sin($dr * (2 * $F – $M)) – 0.0006 * sin($dr * (2 * $F + $Mpr));

$C1 = $C1 + 0.0010 * sin($dr * (2 * $F – $Mpr)) + 0.0005 * sin($dr * (2 * $Mpr + $M));

if ($T < –11) {

$deltat = 0.001 + 0.000839 * $T + 0.0002261 * $T2 – 0.00000845 * $T3 – 0.000000081 * $T * $T3;

} else {

$deltat = –0.000278 + 0.000265 * $T + 0.000262 * $T2;

};

$JdNew = $Jd1 + $C1 – $deltat;

//echo “JdNew = $JdNewn”;

return floor($JdNew + 0.5 + $timeZone / 24);

}

private static function getSunLongitude($jdn, $timeZone)

{

$T = ($jdn – 2451545.5 – $timeZone / 24) / 36525; // Time in Julian centuries from 2000-01-01 12:00:00 GMT

$T2 = $T * $T;

$dr = M_PI / 180; // degree to radian

$M = 357.52910 + 35999.05030 * $T – 0.0001559 * $T2 – 0.00000048 * $T * $T2; // mean anomaly, degree

$L0 = 280.46645 + 36000.76983 * $T + 0.0003032 * $T2; // mean longitude, degree

$DL = (1.914600 – 0.004817 * $T – 0.000014 * $T2) * sin($dr * $M);

$DL = $DL + (0.019993 – 0.000101 * $T) * sin($dr * 2 * $M) + 0.000290 * sin($dr * 3 * $M);

$L = $L0 + $DL; // true longitude, degree

//echo “ndr = $dr, M = $M, T = $T, DL = $DL, L = $L, L0 = $L0n”;

// obtain apparent longitude by correcting for nutation and aberration

$omega = 125.04 – 1934.136 * $T;

$L = $L – 0.00569 – 0.00478 * sin($omega * $dr);

$L = $L * $dr;

$L = $L – M_PI * 2 * (floor($L / (M_PI * 2))); // Normalize to (0, 2*PI)

return floor($L / M_PI * 6);

}

private static function getSunLongitude2($jdn)

{

//var T, T2, dr, M, L0, DL, lambda, theta, omega;

$T = ($jdn – 2451545.0) / 36525; // Time in Julian centuries from 2000-01-01 12:00:00 GMT

$T2 = $T * $T;

$dr = pi() / 180; // degree to radian

$M = 357.52910 + 35999.05030 * $T – 0.0001559 * $T2 – 0.00000048 * $T * $T2; // mean anomaly, degree

$L0 = 280.46645 + 36000.76983 * $T + 0.0003032 * $T2; // mean longitude, degree

$DL = (1.914600 – 0.004817 * $T – 0.000014 * $T2) * sin($dr * $M);

$DL = $DL + (0.019993 – 0.000101 * $T) * sin($dr * 2 * $M) + 0.000290 * sin($dr * 3 * $M);

$theta = $L0 + $DL; // true longitude, degree

// obtain apparent longitude by correcting for nutation and aberration

$omega = 125.04 – 1934.136 * $T;

$lambda = $theta – 0.00569 – 0.00478 * sin($omega * $dr);

// Convert to radians

$lambda = $lambda * $dr;

$lambda = $lambda – pi() * 2 * (floor($lambda / (pi() * 2))); // Normalize to (0, 2*PI)

return $lambda;

}

private static function getLunarMonth11($yy, $timeZone)

{

$off = self::jdFromDate(31, 12, $yy) – 2415021;

$k = floor($off / 29.530588853);

$nm = self::getNewMoonDay($k, $timeZone);

$sunLong = self::getSunLongitude($nm, $timeZone); // sun longitude at local midnight

if ($sunLong >= 9) {

$nm = self::getNewMoonDay($k – 1, $timeZone);

}

return $nm;

}

private static function getLeapMonthOffset($a11, $timeZone)

{

$k = floor(($a11 – 2415021.076998695) / 29.530588853 + 0.5);

$last = 0;

$i = 1; // We start with the month following lunar month 11

$arc = self::getSunLongitude(self::getNewMoonDay($k + $i, $timeZone), $timeZone);

do {

$last = $arc;

$i = $i + 1;

$arc = self::getSunLongitude(self::getNewMoonDay($k + $i, $timeZone), $timeZone);

} while ($arc != $last && $i < 14);

return $i – 1;

}

/**

* Kiểm tra xem năm dương có nhuận không?

* @param null $yyyy

* @return string

private static function isSolarYearLeap($yyyy = null)

{

if ($yyyy == null) {

$yyyy = date(‘Y’);

}

if ($yyyy % 4 == 0 || ($yyyy % 100 == 0 && $yyyy % 400 == 0)) {

return ‘Năm dương nhuận’;

} else {

return ‘Năm dương không nhuận’;

}

/**

* Kiểm tra xem năm âm tương ứng có nhuận không?

* @param null $yyyy

* @return string

private static function isLunarYearLeap($yyyy = null)

{

if ($yyyy == null) {

$yyyy = date(‘Y’);

}

$arr = array(0, 3, 6, 9, 11, 14, 17);

$leap = $yyyy % 19;

if (in_array($leap, $arr)) {

return ‘Năm âm nhuận’;

} else {

return ‘Năm âm không nhuận’;

}

private static function getDayName($id)

{

$arr = array(

‘Sunday’ => ‘Chủ nhật’,

‘Monday’ => ‘Thứ 2’,

‘Tuesday’ => ‘Thứ 3’,

‘Wednesday’ => ‘Thứ 4’,

‘Thursday’ => ‘Thứ 5’,

‘Friday’ => ‘Thứ 6’,

‘Saturday’ => ‘Thứ 7’

);

if (array_key_exists($id, $arr)) {

return $arr[$id];

} else {

return ”;

}

private static function getMonthName($id)

{

$arr2 = array(‘Tháng Giêng’, ‘Tháng Hai’, ‘Tháng Ba’, ‘Tháng Tư’, ‘Tháng Năm’, ‘Tháng Sáu’, ‘Tháng Bảy’, ‘Tháng Tám’, ‘Tháng Chín’, ‘Tháng Mười’, ‘Tháng Mười Một’, ‘Tháng Chạp’);

return $arr2[$id];

}

private static function getListCan()

{

return array(‘Giáp’, ‘Ất’, ‘Bính’, ‘Đinh’, ‘Mậu’, ‘Kỷ’, ‘Canh’, ‘Tân’, ‘Nhâm’, ‘Quí’);

}

private static function getListChi()

{

return array(‘Tý’, ‘Sửu’, ‘Dần’, ‘Mão’, ‘Thìn’, ‘Tỵ’, ‘Ngọ’, ‘Mùi’, ‘Thân’, ‘Dậu’, ‘Tuất’, ‘Hợi’);

}

private static function getCanChiNam($nam)

{

$arrCan = self::getListCan();

$arrChi = self::getListChi();

$can = ($nam + 6) % 10;

$chi = ($nam + 8) % 12;

return ‘Năm ‘ . $arrCan[$can] . ‘ ‘ . $arrChi[$chi];

}

private static function getCanChiThang($nam, $thang)

{

$arrCan = self::getListCan();

$arrChi = self::getListChi();

$can = ($nam * 12 + $thang + 3) % 10;

$chi = ($thang + 1) % 12;

return ‘Tháng ‘ . $arrCan[$can] . ‘ ‘ . $arrChi[$chi];

}

private static function getCanChiNgay($jd)

{

$arrCan = self::getListCan();

$arrChi = self::getListChi();

$can = ($jd + 9) % 10;

$chi = ($jd + 1) % 12;

return ‘Ngày ‘ . $arrCan[$can] . ‘ ‘ . $arrChi[$chi];

}

private static function getCanChiGio($jd)

{

$arrCan = self::getListCan();

$arrChi = self::getListChi();

$can = ($jd – 1) * 2 % 10;

return ‘Giờ ‘ . $arrCan[$can] . ‘ ‘ . $arrChi[0];

}

private static function getTietKhi($jd)

{

$arr = array(

‘Xuân phân’, ‘Thanh minh’, ‘Cốc vũ’, ‘Lập hạ’, ‘Tiểu mãn’, ‘Mang chủng’,

‘Hạ chí’, ‘Tiểu thử’, ‘Đại thử’, ‘Lập thu’, ‘Xử thử’, ‘Bạch lộ’,

‘Thu phân’, ‘Hàn lộ’, ‘Sương giáng’, ‘Lập đông’, ‘Tiểu tuyết’, ‘Đại tuyết’,

‘Đông chí’, ‘Tiểu hàn’, ‘Đại hàn’, ‘Lập xuân’, ‘Vũ thủy’, ‘Kinh trập’

);

$tietkhi = floor(self::getSunLongitude2($jd + 1 – 0.5 – 7.0 / 24.0) / pi() * 12);

return $arr[$tietkhi];

}

private static function getHoangDao($id)

{

$arr = array(“110100101100”, “001101001011”, “110011010010”, “101100110100”, “001011001101”, “010010110011”);

return $arr[$id];

}

private static function getGioHoangDao($jd)

{

$chiOfDay = ($jd + 1) % 12;

$gioHD = self::getHoangDao($chiOfDay % 6); // same values for Ty’ (1) and Ngo. (6), for Suu and Mui etc.

$ret = “”;

$count = 0;

for ($i = 0; $i < 12; $i++) {

$s = substr($gioHD, $i, 1);

if ($s == ‘1’) {

$ret .= self::getListChi()[$i];

$ret .= ‘ (‘ . (($i * 2 + 23) % 24) . ‘-‘ . (($i * 2 + 1) % 24) . ‘)’;

if ($count++ < 5) $ret .= ‘, ‘;

//if (count == 3) ret += ‘n’;

}

return $ret;

}

private static function getSuKienNam($da, $ma)

{

$arr = array(

‘1_1’ => ‘Tết Nguyên Đán’,

’15_1′ => ‘Rằm Tháng Giêng’,

’10_3′ => ‘Giỗ Tổ Hùng Vương’,

’15_4′ => ‘Lễ Phật Đản’,

‘5_5’ => ‘Tết Đoan Ngọ’,

’15_7′ => ‘Lễ Vu Lan’,

’15_8′ => ‘Tết Trung Thu’,

’23_12′ => ‘Ông Táo chầu trời’

);

if (array_key_exists($da . ‘_’ . $ma, $arr)) {

return $arr[$da . ‘_’ . $ma];

} else {

return ‘Ngày thường’;

}

private static function getDateSunInfo($dd, $mm, $yy)

{

return date_sun_info(strtotime($yy . ‘-‘ . $mm . ‘-‘ . $dd), 21.03, 105.85);

}

private static function getNewMoon($dd, $mm, $yy){

$k = floor((self::jdFromDate($dd, $mm, $yy) – 2415021) / 29.530588853);

$j = self::getNewMoonDay($k, 7.0);

$arrDate = self::jdToDate($j);

$preDate = mktime(0, 0, 0, $arrDate[1], $arrDate[0] – 1, $arrDate[2]);

return date(‘d/m/Y’, $preDate);

}

private static function getEndOfMoon($timestamp){

$synmonth = 29.53058868;

$arrPhase = self::phasehunt($timestamp, $synmonth);

$next_new_moon = $arrPhase[4];

$preDate = mktime(0, 0, 0, date(‘m’, $next_new_moon), date(‘d’, $next_new_moon) – 1, date(‘Y’, $next_new_moon));

$preDate = self::convertSolar2Lunar(date(‘d’, $preDate), date(‘m’, $preDate), date(‘Y’, $preDate));

if(is_numeric($preDate)){

return date(‘d’, $preDate);

}else{

return null;

}

/* Comvert solar date dd/mm/yyyy to the corresponding lunar date */

public static function getArrayDateInfo($dd, $mm, $yy, $timeZone = 7.0)

{

$dayNumber = self::jdFromDate($dd, $mm, $yy);

$k = floor(($dayNumber – 2415021.076998695) / 29.530588853);

$monthStart = self::getNewMoonDay($k + 1, $timeZone);

if ($monthStart > $dayNumber) {

$monthStart = self::getNewMoonDay($k, $timeZone);

}

$a11 = self::getLunarMonth11($yy, $timeZone);

$b11 = $a11;

if ($a11 >= $monthStart) {

$lunarYear = $yy;

$a11 = self::getLunarMonth11($yy – 1, $timeZone);

} else {

$lunarYear = $yy + 1;

$b11 = self::getLunarMonth11($yy + 1, $timeZone);

}

$lunarDay = $dayNumber – $monthStart + 1;

$diff = floor(($monthStart – $a11) / 29);

$lunarLeap = 0;

$lunarMonth = $diff + 11;

if ($b11 – $a11 > 365) {

$leapMonthDiff = self::getLeapMonthOffset($a11, $timeZone);

if ($diff >= $leapMonthDiff) {

$lunarMonth = $diff + 10;

if ($diff == $leapMonthDiff) {

$lunarLeap = 1;

}

if ($lunarMonth > 12) {

$lunarMonth = $lunarMonth – 12;

}

if ($lunarMonth >= 11 && $diff < 4) {

$lunarYear -= 1;

}

$intDate = strtotime($yy . ‘-‘ . $mm . ‘-‘ . $dd);

$dateSunInfo = self::getDateSunInfo($dd, $mm, $yy);

$nhuan = ($lunarLeap == 1) ? ‘Nhuận’ : ‘Không’;

$tenthang = (self::getEndOfMoon($intDate) == 30 ? ‘Đủ’ : ‘Thiếu’);

$moon = self::getMoonTimes($dd, $mm, $yy, 21.03, 105.85);

return array(

‘input_duong’ => date(‘Y-m-d’, $intDate),

‘output_am’ => date(‘Y-m-d’, strtotime($lunarYear . ‘-‘ . $lunarMonth . ‘-‘ . $lunarDay)),

//’lunarLeap’ => $lunarLeap,

‘thu_en’ => date(‘l’, $intDate),

‘thu_vi’ => self::getDayName(date(‘l’, $intDate)),

‘thang_am’ => self::getMonthName($lunarMonth – 1),

‘thang_am_nhuan’ => $nhuan,

‘thang_am_du_thieu’ => $tenthang,

‘nam_duong_nhuan’ => self::isSolarYearLeap($yy),

‘nam_am_nhuan’ => self::isLunarYearLeap($yy),

‘can_chi_nam’ => self::getCanChiNam($lunarYear),

‘can_chi_thang’ => self::getCanChiThang($lunarYear, $lunarMonth),

‘can_chi_ngay’ => self::getCanChiNgay(self::jdFromDate($dd, $mm, $yy)),

‘can_chi_gio’ => self::getCanChiGio(self::jdFromDate($dd, $mm, $yy)),

‘tiet_khi’ => self::getTietKhi(self::jdFromDate($dd, $mm, $yy)),

‘day_info’ => self::getSuKienNam($lunarDay, $lunarMonth),

‘hoang_dao’ => self::getGioHoangDao(self::jdFromDate($dd, $mm, $yy)),

‘sun_info’ => array(

‘sunrise’ => date(‘H:i:s’, $dateSunInfo[‘sunrise’]),

‘transit’ => date(‘H:i:s’, $dateSunInfo[‘transit’]),

‘sunset’ => date(‘H:i:s’, $dateSunInfo[‘sunset’]),

‘sun_length’ => gmdate(‘H:i:s’, $dateSunInfo[‘sunset’] – $dateSunInfo[‘sunrise’]),

//’chang_vang_1′ => date(‘H:i:s’, $dateSunInfo[‘civil_twilight_begin’]),

//’chang_vang_2′ => date(‘H:i:s’, $dateSunInfo[‘civil_twilight_end’]),

//’chang_vang_hang_hai_1′ => date(‘H:i:s’, $dateSunInfo[‘nautical_twilight_begin’]),

//’chang_vang_hang_hai_2′ => date(‘H:i:s’, $dateSunInfo[‘nautical_twilight_end’]),

//’chang_vang_thien_van_1′ => date(‘H:i:s’, $dateSunInfo[‘astronomical_twilight_begin’]),

//’chang_vang_thien_van_2′ => date(‘H:i:s’, $dateSunInfo[‘astronomical_twilight_end’])

‘moon_info’ => array(

‘moonrise’ => date(‘H:i:s’, $moon[‘moonrise’]),

‘moonset’ => date(‘H:i:s’, $moon[‘moonset’]),

‘moon_lenght’ => gmdate(‘H:i:s’, $moon[‘moonset’] – $moon[‘moonrise’]),

‘moon_phase’ => self::getMoonPhase($dd, $mm, $yy)

‘moon_cycle’ => self::getMoonCycle($intDate)

);

}

public static function convertSolar2Lunar($dd, $mm, $yy, $timeZone = 7.0)

{

$dayNumber = self::jdFromDate($dd, $mm, $yy);

$k = floor(($dayNumber – 2415021.076998695) / 29.530588853);

$monthStart = self::getNewMoonDay($k + 1, $timeZone);

if ($monthStart > $dayNumber) {

$monthStart = self::getNewMoonDay($k, $timeZone);

}

$a11 = self::getLunarMonth11($yy, $timeZone);

$b11 = $a11;

if ($a11 >= $monthStart) {

$lunarYear = $yy;

$a11 = self::getLunarMonth11($yy – 1, $timeZone);

} else {

$lunarYear = $yy + 1;

$b11 = self::getLunarMonth11($yy + 1, $timeZone);

}

$lunarDay = $dayNumber – $monthStart + 1;

$diff = floor(($monthStart – $a11) / 29);

$lunarLeap = 0;

$lunarMonth = $diff + 11;

if ($b11 – $a11 > 365) {

$leapMonthDiff = self::getLeapMonthOffset($a11, $timeZone);

if ($diff >= $leapMonthDiff) {

$lunarMonth = $diff + 10;

if ($diff == $leapMonthDiff) {

$lunarLeap = 1;

}

if ($lunarMonth > 12) {

$lunarMonth = $lunarMonth – 12;

}

if ($lunarMonth >= 11 && $diff < 4) {

$lunarYear -= 1;

}

return strtotime($lunarYear . ‘-‘ . $lunarMonth . ‘-‘ . $lunarDay);

}

/* Convert a lunar date to the corresponding solar date */

public static function convertLunar2Solar($lunarDay, $lunarMonth, $lunarYear, $lunarLeap, $timeZone = 7.0)

{

if ($lunarMonth < 11) {

$a11 = self::getLunarMonth11($lunarYear – 1, $timeZone);

$b11 = self::getLunarMonth11($lunarYear, $timeZone);

} else {

$a11 = self::getLunarMonth11($lunarYear, $timeZone);

$b11 = self::getLunarMonth11($lunarYear + 1, $timeZone);

}

$k = floor(0.5 + ($a11 – 2415021.076998695) / 29.530588853);

$off = $lunarMonth – 11;

if ($off < 0) {

$off += 12;

}

if ($b11 – $a11 > 365) {

$leapOff = self::getLeapMonthOffset($a11, $timeZone);

$leapMonth = $leapOff – 2;

if ($leapMonth < 0) {

$leapMonth += 12;

}

if ($lunarLeap != 0 && $lunarMonth != $leapMonth) {

return array(0, 0, 0);

} else if ($lunarLeap != 0 || $off >= $leapOff) {

$off += 1;

}

$monthStart = self::getNewMoonDay($k + $off, $timeZone);

return self::jdToDate($monthStart + $lunarDay – 1);

}

//——————————————— THE MOON INFO —————————————————–

/**

* Calculates the moon rise/set for a given location and day of year

public static function getMoonTimes($day, $month, $year, $lat, $lon)

{

$utrise = $utset = 0;

$timezone = (int)($lon / 15);

$date = self::modifiedJulianDate($month, $day, $year);

$date -= $timezone / 24;

$latRad = deg2rad($lat);

$sinho = 0.0023271056;

$sglat = sin($latRad);

$cglat = cos($latRad);

$rise = false;

$set = false;

$above = false;

$hour = 1;

$ym = self::sinAlt($date, $hour – 1, $lon, $cglat, $sglat) – $sinho;

$above = $ym > 0;

while ($hour < 25 && (false == $set || false == $rise)) {

$yz = self::sinAlt($date, $hour, $lon, $cglat, $sglat) – $sinho;

$yp = self::sinAlt($date, $hour + 1, $lon, $cglat, $sglat) – $sinho;

$quadout = self::quad($ym, $yz, $yp);

$nz = $quadout[0];

$z1 = $quadout[1];

$z2 = $quadout[2];

$xe = $quadout[3];

$ye = $quadout[4];

if ($nz == 1) {

if ($ym < 0) {

$utrise = $hour + $z1;

$rise = true;

} else {

$utset = $hour + $z1;

$set = true;

}

if ($nz == 2) {

if ($ye < 0) {

$utrise = $hour + $z2;

$utset = $hour + $z1;

} else {

$utrise = $hour + $z1;

$utset = $hour + $z2;

}

$ym = $yp;

$hour += 2.0;

}

// Convert to unix timestamps and return as an array

$utrise = self::convertTime($utrise);

$utset = self::convertTime($utset);

$moonrise = $rise ? mktime($utrise[‘hrs’], $utrise[‘min’], 0, $month, $day, $year) : mktime(0, 0, 0, $month, $day + 1, $year);

$moonset = $set ? mktime($utset[‘hrs’], $utset[‘min’], 0, $month, $day, $year) : mktime(0, 0, 0, $month, $day + 1, $year);

$retVal = array(

‘moonrise’ => $moonrise,

‘moonset’ => $moonset

);

return $retVal;

}

/**

* finds the parabola throuh the three points (-1,ym), (0,yz), (1, yp)

* and returns the coordinates of the max/min (if any) xe, ye

* the values of x where the parabola crosses zero (roots of the self::quadratic)

* and the number of roots (0, 1 or 2) within the interval [-1, 1]

* well, this routine is producing sensible answers

* results passed as array [nz, z1, z2, xe, ye]

private static function quad($ym, $yz, $yp)

{

$nz = $z1 = $z2 = 0;

$a = 0.5 * ($ym + $yp) – $yz;

$b = 0.5 * ($yp – $ym);

$c = $yz;

$xe = –$b / (2 * $a);

$ye = ($a * $xe + $b) * $xe + $c;

$dis = $b * $b – 4 * $a * $c;

if ($dis > 0) {

$dx = 0.5 * sqrt($dis) / abs($a);

$z1 = $xe – $dx;

$z2 = $xe + $dx;

$nz = abs($z1) < 1 ? $nz + 1 : $nz;

$nz = abs($z2) < 1 ? $nz + 1 : $nz;

$z1 = $z1 < –1 ? $z2 : $z1;

}

return array($nz, $z1, $z2, $xe, $ye);

}

/**

* this rather mickey mouse function takes a lot of

* arguments and then returns the sine of the altitude of the moon

private static function sinAlt($mjd, $hour, $glon, $cglat, $sglat)

{

$mjd += $hour / 24;

$t = ($mjd – 51544.5) / 36525;

$objpos = self::minimoon($t);

$ra = $objpos[1];

$dec = $objpos[0];

$decRad = deg2rad($dec);

$tau = 15 * (self::lmst($mjd, $glon) – $ra);

return $sglat * sin($decRad) + $cglat * cos($decRad) * cos(deg2rad($tau));

}

/**

* returns an angle in degrees in the range 0 to 360

private static function degRange($x)

{

$b = $x / 360;

$a = 360 * ($b – (int)$b);

$retVal = $a < 0 ? $a + 360 : $a;

return $retVal;

}

private static function lmst($mjd, $glon)

{

$d = $mjd – 51544.5;

$t = $d / 36525;

$lst = self::degRange(280.46061839 + 360.98564736629 * $d + 0.000387933 * $t * $t – $t * $t * $t / 38710000);

return $lst / 15 + $glon / 15;

}

/**

* takes t and returns the geocentric ra and dec in an array mooneq

* claimed good to 5′ (angle) in ra and 1′ in dec

* tallies with another approximate method and with ICE for a couple of dates

private static function minimoon($t)

{

$p2 = 6.283185307;

$arc = 206264.8062;

$coseps = 0.91748;

$sineps = 0.39778;

$lo = self::frac(0.606433 + 1336.855225 * $t);

$l = $p2 * self::frac(0.374897 + 1325.552410 * $t);

$l2 = $l * 2;

$ls = $p2 * self::frac(0.993133 + 99.997361 * $t);

$d = $p2 * self::frac(0.827361 + 1236.853086 * $t);

$d2 = $d * 2;

$f = $p2 * self::frac(0.259086 + 1342.227825 * $t);

$f2 = $f * 2;

$sinls = sin($ls);

$sinf2 = sin($f2);

$dl = 22640 * sin($l);

$dl += –4586 * sin($l – $d2);

$dl += 2370 * sin($d2);

$dl += 769 * sin($l2);

$dl += –668 * $sinls;

$dl += –412 * $sinf2;

$dl += –212 * sin($l2 – $d2);

$dl += –206 * sin($l + $ls – $d2);

$dl += 192 * sin($l + $d2);

$dl += –165 * sin($ls – $d2);

$dl += –125 * sin($d);

$dl += –110 * sin($l + $ls);

$dl += 148 * sin($l – $ls);

$dl += –55 * sin($f2 – $d2);

$s = $f + ($dl + 412 * $sinf2 + 541 * $sinls) / $arc;

$h = $f – $d2;

$n = –526 * sin($h);

$n += 44 * sin($l + $h);

$n += –31 * sin(–$l + $h);

$n += –23 * sin($ls + $h);

$n += 11 * sin(–$ls + $h);

$n += –25 * sin(–$l2 + $f);

$n += 21 * sin(–$l + $f);

$L_moon = $p2 * self::frac($lo + $dl / 1296000);

$B_moon = (18520.0 * sin($s) + $n) / $arc;

$cb = cos($B_moon);

$x = $cb * cos($L_moon);

$v = $cb * sin($L_moon);

$w = sin($B_moon);

$y = $coseps * $v – $sineps * $w;

$z = $sineps * $v + $coseps * $w;

$rho = sqrt(1 – $z * $z);

$dec = (360 / $p2) * atan($z / $rho);

$ra = (48 / $p2) * atan($y / ($x + $rho));

$ra = $ra < 0 ? $ra + 24 : $ra;

return array($dec, $ra);

}

/**

* returns the self::fractional part of x as used in self::minimoon and minisun

private static function frac($x)

{

$x -= (int)$x;

return $x < 0 ? $x + 1 : $x;

}

/**

* Takes the day, month, year and hours in the day and returns the

* modified julian day number defined as mjd = jd – 2400000.5

* checked OK for Greg era dates – 26th Dec 02

private static function modifiedJulianDate($month, $day, $year)

{

if ($month <= 2) {

$month += 12;

$year—;

}

$a = 10000 * $year + 100 * $month + $day;

$b = 0;

if ($a <= 15821004.1) {

$b = –2 * (int)(($year + 4716) / 4) – 1179;

} else {

$b = (int)($year / 400) – (int)($year / 100) + (int)($year / 4);

}

$a = 365 * $year – 679004;

return $a + $b + (int)(30.6001 * ($month + 1)) + $day;

}

/**

* Converts an hours decimal to hours and minutes

private static function convertTime($hours)

{

$hrs = (int)($hours * 60 + 0.5) / 60.0;

$h = (int)($hrs);

$m = (int)(60 * ($hrs – $h) + 0.5);

return array(‘hrs’ => $h, ‘min’ => $m);

}

private static function getMoonPhase($day, $month, $year)

{

$date = strtotime($year.‘-‘.$month.‘-‘.$day);

// calculate lunar phase (1900 – 2199)

$year = date(‘Y’, $date);

$month = date(‘n’, $date);

$day = date(‘j’, $date);

if ($month < 4) {

$year = $year – 1;

$month = $month + 12;

}

$days_y = 365.25 * $year;

$days_m = 30.42 * $month;

$julian = $days_y + $days_m + $day – 694039.09;

$julian = $julian / 29.53;

$phase = intval($julian);

$julian = $julian – $phase;

$phase = round($julian * 8 + 0.5);

if ($phase == 8) {

$phase = 0;

}

//$phase_array = array(‘new’, ‘waxing crescent’, ‘first quarter’, ‘waxing gibbous’, ‘full’, ‘waning gibbous’, ‘last quarter’, ‘waning crescent’);

$phase_array = array(

‘Trăng mới’,

‘Trăng lưỡi liềm đầu tháng’,

‘Trăng bán nguyệt đầu tháng’,

‘Trăng khuyết đầu tháng’,

‘Trăng tròn’,

‘Trăng khuyết cuối tháng’,

‘Trăng bán nguyệt cuối tháng’,

‘Trăng lưỡi liềm cuối tháng’

);

return $phase_array[$phase];

}

//——————————————— THE MOON INFO —————————————————–

public static function getMoonCycle( $pdate = null ) {

if( is_null( $pdate ) )

$pdate = time();

/* Astronomical constants */

$epoch = 2444238.5; // 1980 January 0.0

/* Constants defining the Sun’s apparent orbit */

$elonge = 278.833540; // Ecliptic longitude of the Sun at epoch 1980.0

$elongp = 282.596403; // Ecliptic longitude of the Sun at perigee

$eccent = 0.016718; // Eccentricity of Earth’s orbit

$sunsmax = 1.495985e8; // Semi-major axis of Earth’s orbit, km

$sunangsiz = 0.533128; // Sun’s angular size, degrees, at semi-major axis distance

/* Elements of the Moon’s orbit, epoch 1980.0 */

$mmlong = 64.975464; // Moon’s mean longitude at the epoch

$mmlongp = 349.383063; // Mean longitude of the perigee at the epoch

$mlnode = 151.950429; // Mean longitude of the node at the epoch

$minc = 5.145396; // Inclination of the Moon’s orbit

$mecc = 0.054900; // Eccentricity of the Moon’s orbit

$mangsiz = 0.5181; // Moon’s angular size at distance a from Earth

$msmax = 384401; // Semi-major axis of Moon’s orbit in km

$mparallax = 0.9507; // Parallax at distance a from Earth

$synmonth = 29.53058868; // Synodic month (new Moon to new Moon)

$lunatbase = 2423436.0; // Base date for E. W. Brown’s numbered series of lunations (1923 January 16)

/* Properties of the Earth */

// $earthrad = 6378.16; // Radius of Earth in kilometres

// $PI = 3.14159265358979323846; // Assume not near black hole

$timestamp = $pdate;

// pdate is coming in as a UNIX timstamp, so convert it to Julian

$pdate = $pdate / 86400 + 2440587.5;

/* Calculation of the Sun’s position */

$Day = $pdate – $epoch; // Date within epoch

$N = self::fixangle((360 / 365.2422) * $Day); // Mean anomaly of the Sun

$M = self::fixangle($N + $elonge – $elongp); // Convert from perigee co-ordinates to epoch 1980.0

$Ec = self::kepler($M, $eccent); // Solve equation of Kepler

$Ec = sqrt((1 + $eccent) / (1 – $eccent)) * tan($Ec / 2);

$Ec = 2 * rad2deg(atan($Ec)); // True anomaly

$Lambdasun = self::fixangle($Ec + $elongp); // Sun’s geocentric ecliptic longitude

$F = ((1 + $eccent * cos(deg2rad($Ec))) / (1 – $eccent * $eccent)); // Orbital distance factor

$SunDist = $sunsmax / $F; // Distance to Sun in km

$SunAng = $F * $sunangsiz; // Sun’s angular size in degrees

/* Calculation of the Moon’s position */

$ml = self::fixangle(13.1763966 * $Day + $mmlong); // Moon’s mean longitude

$MM = self::fixangle($ml – 0.1114041 * $Day – $mmlongp); // Moon’s mean anomaly

$MN = self::fixangle($mlnode – 0.0529539 * $Day); // Moon’s ascending node mean longitude

$Ev = 1.2739 * sin(deg2rad(2 * ($ml – $Lambdasun) – $MM)); // Evection

$Ae = 0.1858 * sin(deg2rad($M)); // Annual equation

$A3 = 0.37 * sin(deg2rad($M)); // Correction term

$MmP = $MM + $Ev – $Ae – $A3; // Corrected anomaly

$mEc = 6.2886 * sin(deg2rad($MmP)); // Correction for the equation of the centre

$A4 = 0.214 * sin(deg2rad(2 * $MmP)); // Another correction term

$lP = $ml + $Ev + $mEc – $Ae + $A4; // Corrected longitude

$V = 0.6583 * sin(deg2rad(2 * ($lP – $Lambdasun))); // Variation

$lPP = $lP + $V; // True longitude

$NP = $MN – 0.16 * sin(deg2rad($M)); // Corrected longitude of the node

$y = sin(deg2rad($lPP – $NP)) * cos(deg2rad($minc)); // Y inclination coordinate

$x = cos(deg2rad($lPP – $NP)); // X inclination coordinate

$Lambdamoon = rad2deg(atan2($y, $x)) + $NP; // Ecliptic longitude

$BetaM = rad2deg(asin(sin(deg2rad($lPP – $NP)) * sin(deg2rad($minc)))); // Ecliptic latitude

/* Calculation of the phase of the Moon */

$MoonAge = $lPP – $Lambdasun; // Age of the Moon in degrees

$MoonPhase = (1 – cos(deg2rad($MoonAge))) / 2; // Phase of the Moon

// Distance of moon from the centre of the Earth

$MoonDist = ($msmax * (1 – $mecc * $mecc)) / (1 + $mecc * cos(deg2rad($MmP + $mEc)));

$MoonDFrac = $MoonDist / $msmax;

$MoonAng = $mangsiz / $MoonDFrac; // Moon’s angular diameter

// $MoonPar = $mparallax / $MoonDFrac; // Moon’s parallax

// store results

$phase = self::fixangle($MoonAge) / 360;

$result = array(

//’phase’ => $phase,

//’illum’ => $MoonPhase,

‘illum_percent’ => round($MoonPhase*100, 2),

‘age’ => $synmonth * $phase,

‘dist’ => $MoonDist,

//’angdia’ => $MoonAng,

‘sundist’ => $SunDist,

//’sunangdia’ => $SunAng,

‘new_moon’ => self::get_phase(0, $timestamp, $synmonth),

‘first_quarter’ => self::get_phase(1, $timestamp, $synmonth),

‘full_moon’ => self::get_phase(2, $timestamp, $synmonth),

‘last_quarter’ => self::get_phase(3, $timestamp, $synmonth),

‘next_new_moon’ => self::get_phase(4, $timestamp, $synmonth),

‘next_first_quarter’ => self::get_phase(5, $timestamp, $synmonth),

‘next_full_moon’ => self::get_phase(6, $timestamp, $synmonth),

‘next_last_quarter’ => self::get_phase(7, $timestamp, $synmonth)

);

return $result;

}

private static function fixangle($a) {

return ( $a – 360 * floor($a / 360) );

}

// KEPLER — Solve the equation of Kepler.

private static function kepler($m, $ecc) {

$epsilon = 0.000001; // 1E-6

$e = $m = deg2rad($m);

do {

$delta = $e – $ecc * sin($e) – $m;

$e -= $delta / ( 1 – $ecc * cos($e) );

}

while ( abs($delta) > $epsilon );

return $e;

}

/* Calculates time of the mean new Moon for a given

base date. This argument K to this function is the

precomputed synodic month index, given by:

K = (year – 1900) * 12.3685

where year is expressed as a year and fractional year.

private static function meanphase($sdate, $k, $synmonth){

// Time in Julian centuries from 1900 January 0.5

$t = ( $sdate – 2415020.0 ) / 36525;

$t2 = $t * $t;

$t3 = $t2 * $t;

$nt1 = 2415020.75933 + $synmonth * $k

+ 0.0001178 * $t2

– 0.000000155 * $t3

+ 0.00033 * sin( deg2rad( 166.56 + 132.87 * $t – 0.009173 * $t2 ) );

return $nt1;

}

/* Given a K value used to determine the mean phase of

the new moon, and a phase selector (0.0, 0.25, 0.5,

0.75), obtain the true, corrected phase time.

private static function truephase($k, $phase, $synmonth){

$apcor = false;

$k += $phase; // Add phase to new moon time

$t = $k / 1236.85; // Time in Julian centuries from 1900 January 0.5

$t2 = $t * $t; // Square for frequent use

$t3 = $t2 * $t; // Cube for frequent use

$pt = 2415020.75933 // Mean time of phase

+ $synmonth * $k

+ 0.0001178 * $t2

– 0.000000155 * $t3

+ 0.00033 * sin( deg2rad( 166.56 + 132.87 * $t – 0.009173 * $t2 ) );

$m = 359.2242 + 29.10535608 * $k – 0.0000333 * $t2 – 0.00000347 * $t3; // Sun’s mean anomaly

$mprime = 306.0253 + 385.81691806 * $k + 0.0107306 * $t2 + 0.00001236 * $t3; // Moon’s mean anomaly

$f = 21.2964 + 390.67050646 * $k – 0.0016528 * $t2 – 0.00000239 * $t3; // Moon’s argument of latitude

if ( $phase < 0.01 || abs( $phase – 0.5 ) < 0.01 ) {

// Corrections for New and Full Moon

$pt += (0.1734 – 0.000393 * $t) * sin( deg2rad( $m ) )

+ 0.0021 * sin( deg2rad( 2 * $m ) )

– 0.4068 * sin( deg2rad( $mprime ) )

+ 0.0161 * sin( deg2rad( 2 * $mprime) )

– 0.0004 * sin( deg2rad( 3 * $mprime ) )

+ 0.0104 * sin( deg2rad( 2 * $f ) )

– 0.0051 * sin( deg2rad( $m + $mprime ) )

– 0.0074 * sin( deg2rad( $m – $mprime ) )

+ 0.0004 * sin( deg2rad( 2 * $f + $m ) )

– 0.0004 * sin( deg2rad( 2 * $f – $m ) )

– 0.0006 * sin( deg2rad( 2 * $f + $mprime ) )

+ 0.0010 * sin( deg2rad( 2 * $f – $mprime ) )

+ 0.0005 * sin( deg2rad( $m + 2 * $mprime ) );

$apcor = true;

} else if ( abs( $phase – 0.25 ) < 0.01 || abs( $phase – 0.75 ) < 0.01 ) {

$pt += (0.1721 – 0.0004 * $t) * sin( deg2rad( $m ) )

+ 0.0021 * sin( deg2rad( 2 * $m ) )

– 0.6280 * sin( deg2rad( $mprime ) )

+ 0.0089 * sin( deg2rad( 2 * $mprime) )

– 0.0004 * sin( deg2rad( 3 * $mprime ) )

+ 0.0079 * sin( deg2rad( 2 * $f ) )

– 0.0119 * sin( deg2rad( $m + $mprime ) )

– 0.0047 * sin( deg2rad ( $m – $mprime ) )

+ 0.0003 * sin( deg2rad( 2 * $f + $m ) )

– 0.0004 * sin( deg2rad( 2 * $f – $m ) )

– 0.0006 * sin( deg2rad( 2 * $f + $mprime ) )

+ 0.0021 * sin( deg2rad( 2 * $f – $mprime ) )

+ 0.0003 * sin( deg2rad( $m + 2 * $mprime ) )

+ 0.0004 * sin( deg2rad( $m – 2 * $mprime ) )

– 0.0003 * sin( deg2rad( 2 * $m + $mprime ) );

if ( $phase < 0.5 ) // First quarter correction

$pt += 0.0028 – 0.0004 * cos( deg2rad( $m ) ) + 0.0003 * cos( deg2rad( $mprime ) );

else // Last quarter correction

$pt += –0.0028 + 0.0004 * cos( deg2rad( $m ) ) – 0.0003 * cos( deg2rad( $mprime ) );

$apcor = true;

}

if (!$apcor) // function was called with an invalid phase selector

return false;

return $pt;

}

/* Find time of phases of the moon which surround the current date.

Five phases are found, starting and

ending with the new moons which bound the current lunation.

private static function phasehunt($timestamp, $synmonth) {

$sdate = self::utctojulian($timestamp );

$adate = $sdate – 45;

$ats = $timestamp – 86400 * 45;

$yy = (int) gmdate( ‘Y’, $ats );

$mm = (int) gmdate( ‘n’, $ats );

$k1 = floor( ( $yy + ( ( $mm – 1 ) * ( 1 / 12 ) ) – 1900 ) * 12.3685 );

$adate = $nt1 = self::meanphase( $adate, $k1, $synmonth);

while (true) {

$adate += $synmonth;

$k2 = $k1 + 1;

$nt2 = self::meanphase( $adate, $k2, $synmonth);

// if nt2 is close to sdate, then mean phase isn’t good enough, we have to be more accurate

if( abs( $nt2 – $sdate ) < 0.75 )

$nt2 = self::truephase( $k2, 0.0, $synmonth);

if ( $nt1 <= $sdate && $nt2 > $sdate )

break;

$nt1 = $nt2;

$k1 = $k2;

}

// results in Julian dates

$data = array(

self::truephase( $k1, 0.0, $synmonth),

self::truephase( $k1, 0.25, $synmonth),

self::truephase( $k1, 0.5, $synmonth),

self::truephase( $k1, 0.75, $synmonth),

self::truephase( $k2, 0.0, $synmonth),

self::truephase( $k2, 0.25, $synmonth),

self::truephase( $k2, 0.5, $synmonth),

self::truephase( $k2, 0.75, $synmonth)

);

$quarters = array();

foreach( $data as $v ){

$quarters[] = ( $v – 2440587.5 ) * 86400; // convert to UNIX time

}

return $quarters;

}

/* Convert UNIX timestamp to astronomical Julian time (i.e. Julian date plus day fraction). */

private static function utctojulian( $ts ) {

return $ts / 86400 + 2440587.5;

}

private static function get_phase($n, $timestamp, $synmonth ) {

$arrPhase = self::phasehunt($timestamp, $synmonth);

return date(‘d/m/Y’, $arrPhase[$n]);

}

echo ‘<meta charset=”UTF-8″>’;

$d = SunClass::getArrayDateInfo(date(‘d’), date(‘m’), date(‘Y’));

echo ‘<pre>’;

print_r($d);

echo ‘</pre>’;

Cách dùng như sau: ở cuối và ngoài class các bạn thêm đoạn code như sau (xem thêm ở đoạn code trên):

<br />
echo ‘<meta charset=”UTF-8″>’;<br />
$d = SunClass::getArrayDateInfo(date(‘d’), date(‘m’), date(‘Y’));<br />
echo ‘<pre>’;<br />
print_r($d);<br />
echo ‘</pre>’;

echo ‘<meta charset=”UTF-8″>’;

$d = SunClass::getArrayDateInfo(date(‘d’), date(‘m’), date(‘Y’));

echo ‘<pre>’;

print_r($d);

echo ‘</pre>’;

Kết quả:

<br />
Array<br />
(<br />
    [input_duong] => 2016-06-29<br />
    [output_am] => 2016-05-25<br />
    [thu_en] => Wednesday<br />
    [thu_vi] => Thứ 4<br />
    [thang_am] => Tháng Năm<br />
    [thang_am_nhuan] => Không<br />
    [thang_am_du_thieu] => Thiếu<br />
    [nam_duong_nhuan] => Năm dương nhuận<br />
    [nam_am_nhuan] => Năm âm không nhuận<br />
    [can_chi_nam] => Năm Bính Thân<br />
    [can_chi_thang] => Tháng Giáp Ngọ<br />
    [can_chi_ngay] => Ngày Nhâm Ngọ<br />
    [can_chi_gio] => Giờ Canh Tý<br />
    [tiet_khi] => Hạ chí<br />
    [day_info] => Ngày thường<br />
    [hoang_dao] => Tý (23-1), Sửu (1-3), Mão (5-7), Ngọ (11-13), Thân (15-17), Dậu (17-19)<br />
    [sun_info] => Array<br />
        (<br />
            [sunrise] => 05:18:14<br />
            [transit] => 12:00:09<br />
            [sunset] => 18:42:04<br />
            [sun_length] => 13:23:50<br />
        )</p>
<p>    [moon_info] => Array<br />
        (<br />
            [moonrise] => 00:39:00<br />
            [moonset] => 13:25:00<br />
            [moon_lenght] => 12:46:00<br />
            [moon_phase] => Trăng lưỡi liềm cuối tháng<br />
        )</p>
<p>    [moon_cycle] => Array<br />
        (<br />
            [illum_percent] => 39.21<br />
            [age] => 23.170149481457<br />
            [dist] => 363873.09269769<br />
            [sundist] => 152088862.8482<br />
            [new_moon] => 05/06/2016<br />
            [first_quarter] => 12/06/2016<br />
            [full_moon] => 20/06/2016<br />
            [last_quarter] => 28/06/2016<br />
            [next_new_moon] => 04/07/2016<br />
            [next_first_quarter] => 12/07/2016<br />
            [next_full_moon] => 20/07/2016<br />
            [next_last_quarter] => 27/07/2016<br />
        )</p>
<p>)

Array

(

[input_duong] => 2016–06–29

[output_am] => 2016–05–25

[thu_en] => Wednesday

[thu_vi] => Thứ 4

[thang_am] => Tháng Năm

[thang_am_nhuan] => Không

[thang_am_du_thieu] => Thiếu

[nam_duong_nhuan] => Năm dương nhuận

[nam_am_nhuan] => Năm âm không nhuận

[can_chi_nam] => Năm Bính Thân

[can_chi_thang] => Tháng Giáp Ngọ

[can_chi_ngay] => Ngày Nhâm Ngọ

[can_chi_gio] => Giờ Canh Tý

[tiet_khi] => Hạ chí

[day_info] => Ngày thường

[hoang_dao] => Tý (23–1), Sửu (1–3), Mão (5–7), Ngọ (11–13), Thân (15–17), Dậu (17–19)

[sun_info] => Array

(

[sunrise] => 05:18:14

[transit] => 12:00:09

[sunset] => 18:42:04

[sun_length] => 13:23:50

)

[moon_info] => Array

(

[moonrise] => 00:39:00

[moonset] => 13:25:00

[moon_lenght] => 12:46:00

[moon_phase] => Trăng lưỡi liềm cuối tháng

)

[moon_cycle] => Array

(

[illum_percent] => 39.21

[age] => 23.170149481457

[dist] => 363873.09269769

[sundist] => 152088862.8482

[new_moon] => 05/06/2016

[first_quarter] => 12/06/2016

[full_moon] => 20/06/2016

[last_quarter] => 28/06/2016

[next_new_moon] => 04/07/2016

[next_first_quarter] => 12/07/2016

[next_full_moon] => 20/07/2016

[next_last_quarter] => 27/07/2016

)

Tác giả hy vọng, đây sẽ là tài liệu hữu ích cho những ai nghiên cứu tử vi ngày.

Tài liệu tham khảo: các bài viết của tác giả Hồ Ngọc Đức và sưu tầm trên mạng.

Sưu tầm và biên soạn: doanpv

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