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PHP : Function Reference : Date and Time Functions : date_sunrise

date_sunrise

Returns time of sunrise for a given day and location (PHP 5)
mixed date_sunrise ( int timestamp [, int format [, float latitude [, float longitude [, float zenith [, float gmt_offset]]]]] )

Example 443. date_sunrise() example

<?php

/* calculate the sunrise time for Lisbon, Portugal
Latitude: 38.4 North
Longitude: 9 West
Zenith ~= 90
offset: +1 GMT
*/

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

?>

The above example will output something similar to:

Mon Dec 20 2004, sunrise time : 08:54

Code Examples / Notes » date_sunrise

djwice

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 "


Sunrise: ".date_sunrise(time(), SUNFUNCS_RET_STRING, $lat, $long, $zenith, $offset);
echo "
Sunset: ".date_sunset(time(), SUNFUNCS_RET_STRING, $lat, $long, $zenith, $offset);
$zenith=96;
echo "


Civilian Twilight start: ".date_sunrise(time(), SUNFUNCS_RET_STRING, $lat, $long, $zenith, $offset);
echo "
Civilian Twilight end: ".date_sunset(time(), SUNFUNCS_RET_STRING, $lat, $long, $zenith, $offset);
$zenith=102;
echo "


Nautical Twilight start: ".date_sunrise(time(), SUNFUNCS_RET_STRING, $lat, $long, $zenith, $offset);
echo "
Nautical Twilight end: ".date_sunset(time(), SUNFUNCS_RET_STRING, $lat, $long, $zenith, $offset);
$zenith=108;
echo "


Astronomical Twilight start: ".date_sunrise(time(), SUNFUNCS_RET_STRING, $lat, $long, $zenith, $offset);
echo "
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


php

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);
}
?>


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checkdate
date_create
date_date_set
date_default_timezone_get
date_default_timezone_set
date_format
date_isodate_set
date_modify
date_offset_get
date_parse
date_sun_info
date_sunrise
date_sunset
date_time_set
date_timezone_get
date_timezone_set
date
getdate
gettimeofday
gmdate
gmmktime
gmstrftime
idate
localtime
microtime
mktime
strftime
strptime
strtotime
time
timezone_abbreviations_list
timezone_identifiers_list
timezone_name_from_abbr
timezone_name_get
timezone_offset_get
timezone_open
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