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Digg  date_sunrise
Returns time of sunrise for a given day and location
(PHP 5)
Example 443. date_sunrise() example<?phpThe above example will output something similar to: Mon Dec 20 2004, sunrise time : 08:54Code Examples / Notes » date_sunrisedjwice
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 timezone_transitions_get |
