date_sunrise

(PHP 5)

date_sunrise -- 返回给定的日期与地点的日出时间

说明

mixed date_sunrise ( int timestamp [, int format [, float latitude [, float longitude [, float zenith [, float gmt_offset]]]]] )

date_sunrise() 返回给定的日期(以 timestamp 指定)与地点的日出时间。latitudelongitudezenith 参数默认值分别为配置选项中的 date.default_latitudedate.default_longitudedate.sunrise_zenith

latitude 默认是指北纬。因此如果要指定南纬,必须传递一个负值。同样规则也适用于 longitude,其默认是指东经。

gmt_offset 参数的单位是小时。

表格 1. format 常量

常量说明取值举例
SUNFUNCS_RET_STRINGstring 格式返回结果16:46
SUNFUNCS_RET_DOUBLEfloat 格式返回结果16.78243132
SUNFUNCS_RET_TIMESTAMPinteger 格式(时间戳)返回结果1095034606

例子 1. date_sunrise() 例子

<?php

/* 计算葡萄牙里斯本的日出时间
Latitude:  北纬 38.4 度
Longitude: 西经 9 度
Zenith ~= 90
offset: +1 GMT
*/

echo date("D M d Y"). ', sunrise time : ' .date_sunrise(time(), SUNFUNCS_RET_STRING, 38.4, -9, 90, 1);

?>

上例的输出类似于:

Mon Dec 20 2004, sunrise time : 08:54

参见 date_sunset()


add a note add a note User Contributed Notes
php at stock-consulting dot com
27-Mar-2005 08:22
The function of jbr (AT) ya-right.com will run into an infinite loop for dates/locations without, for example, astronomical twilight (it never gets dark enough for astronomical twilight during June in Cologne, for exmple). Below a quick fix:
<?
function sun_times($time, $lat, $lon, $offset, $format, $dst) {
  
$offset += $dst;
  
$offset = $offset == 13 ? -11 : $offset;
  
$math = array(1.5708, 4.71239, 3.14159, 6.28319, (0.0174533 * $lat), (0.0174533 * $lon), (0.261799  * $offset));
  
$data = array('astronomical' => -.309017, 'nautical' => -.207912, 'civil' => -.104528, 'sun' => -.0145439);
  
$sd = explode(' ', date('n j Y z', $time));
  
$times = array();

   foreach (
$data as $a => $b)    {
       for (
$x = 0; $x <= 1; $x++) {
          
$e = $sd[3] + (($math[$x] - $math[5]) / $math[3]);
          
$f = ($e * .017202) - .0574039;
          
$g = $f + .0334405 * sin($f);
          
$g +=  4.93289 + (3.49066E-04) * sin(2 * $f);
           while (
$g < 0) {
              
$g += $math[3];
           }
           while (
$g >= $math[3]) {
              
$g -= $math[3];
           }
          
$g += ($g / $math[0]) - intval($g / $math[0]) == 0 ? 4.84814E-06 : 0;
          
$h = sin($g) / cos($g);
          
$h = atan2(.91746 * $h, 1);
          
$h += $g > $math[1] ? $math[3] : ($g > $math[0] ? $math[2] : 0);
          
$i = .39782 * sin($g);
          
$i = $i / sqrt (-$i * $i + 1);
          
$i = atan2($i, 1);
          
$j = $b - (sin($i) * sin($math[4]));
          
$j = $j / (cos($i) * cos($math[4]));
          
$j = $j / sqrt(-$j * $j + 1);
          
$j = $math[0] - atan2($j, 1);
           if (!
$x) {
              
$j = $math[3] - $j;
           }
          
$k = $j + $h - 0.0172028 * $e - 1.73364;
          
$l = $k - $math[5];
          
$n = $l + $math[6];
// Changes begin here
          
$key = ($a != 'sun' ? ($x ? 'end' : 'start') : ($x ? $a . 'set' : $a . 'rise'));
           if (
is_nan($n)) {
              
$times[$a][$key] = '-';
           } else {
               while (
$n < 0) {
                  
$n += $math[3];
               }
               while (
$n >= $math[3]) {
                  
$n -= $math[3];
               }
              
$n = $n * 3.81972;
              
$hour = intval($n);
              
$mins = intval((($n - $hour) * 60) + 0.5);
              
$times[$a][$key] = date($format, mktime($hour, $mins, 0, $sd[0], $sd[1], $sd[2]));
           }
// Changes end here
      
}
   }
   return(
$times);
}
?>
djwice at [the same] dot com
02-Dec-2004 05:41
The way to use this:

<?php

// De Bilt, The Netherlands, weather station #06260
$lat = 52.10;    // North
$long = 5.18;    // East
$offset = 1;    // difference between GMT and local time in hours

$zenith=90+50/60;
echo
"<br><p>Sunrise: ".date_sunrise(time(), SUNFUNCS_RET_STRING, $lat, $long, $zenith, $offset);
echo
"<br>Sunset: ".date_sunset(time(), SUNFUNCS_RET_STRING, $lat, $long, $zenith, $offset);

$zenith=96;
echo
"<br><p>Civilian Twilight start: ".date_sunrise(time(), SUNFUNCS_RET_STRING, $lat, $long, $zenith, $offset);
echo
"<br>Civilian Twilight end: ".date_sunset(time(), SUNFUNCS_RET_STRING, $lat, $long, $zenith, $offset);

$zenith=102;
echo
"<br><p>Nautical Twilight start: ".date_sunrise(time(), SUNFUNCS_RET_STRING, $lat, $long, $zenith, $offset);
echo
"<br>Nautical Twilight end: ".date_sunset(time(), SUNFUNCS_RET_STRING, $lat, $long, $zenith, $offset);

$zenith=108;
echo
"<br><p>Astronomical Twilight start: ".date_sunrise(time(), SUNFUNCS_RET_STRING, $lat, $long, $zenith, $offset);
echo
"<br>Astronomical Twilight end: ".date_sunset(time(), SUNFUNCS_RET_STRING, $lat, $long, $zenith, $offset);

?>

Zenith according to the U.S. Navy's 1990 Almanac for Computers.

Thanks to George King.
More sources about this topic:

http://www.qarlos.free.fr/navegacion/Sextante/formulas.htm
http://williams.best.vwh.net/sunrise_sunset_algorithm.htm
http://www.kevinboone.com/suntimes.html
http://star-www.st-and.ac.uk/~fv/webnotes/chapt12.htm