date_sun_info
Just for those that are as stupid as me
for the settings in php.ini and sunrise/sunset after googling for a while if found this info
;`Zenith' is the angle that the centre of the Sun makes to a line perpendicular to the Earth's surface.
;
; The best Overall figure for zenith is 90+(50/60) degrees for true sunrise/sunset
; Civil twilight 96 degrees - Conventionally used to signify twilight
; Nautical twilight 102 degrees - the point at which the horizon stops being visible at sea.
; Astronical twilight at 108 degrees - the point when Sun stops being a source of any illumination.
;
;date.sunrise_zenith = 90.583333 85.4
;date.sunset_zenith = 90.583333 85.4
date_sunrise
(PHP 5)
date_sunrise — Returns time of sunrise for a given day and location
Описание
mixed date_sunrise
( int $timestamp
[, int $format
[, float $latitude
[, float $longitude
[, float $zenith
[, float $gmt_offset
]]]]] )
date_sunrise() returns the sunrise time for a given day (specified as a timestamp ) and location.
Список параметров
- timestamp
-
The timestamp of the day from which the sunrise time is taken.
- format
-
format constants constant description example SUNFUNCS_RET_STRING returns the result as string 16:46 SUNFUNCS_RET_DOUBLE returns the result as float 16.78243132 SUNFUNCS_RET_TIMESTAMP returns the result as integer (timestamp) 1095034606 - latitude
-
Defaults to North, pass in a negative value for South. See also: date.default_latitude
- longitude
-
Defaults to East, pass in a negative value for West. See also: date.default_longitude
- zenith
-
Default: date.sunrise_zenith
- gmtoffset
-
Specified in hours.
Возвращаемые значения
Returns the sunrise time in a specified format on success, or FALSE on failure.
Errors/Exceptions
Every call to a date/time function will generate a E_NOTICE if the time zone is not valid, and/or a E_STRICT message if using the system settings or the TZ environment variable. See also date_default_timezone_set()
Список изменений
| Версия | Описание |
|---|---|
| 5.1.0 | Now issues the E_STRICT and E_NOTICE time zone errors. |
Примеры
Пример #1 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);
?>
Результатом выполнения данного примера будет что-то подобное:
Mon Dec 20 2004, sunrise time : 08:54
add a note
User Contributed Notesdate_sunrise
fingers at 4tfingers dot info
25-Apr-2008 08:47
25-Apr-2008 08:47
php at stock-consulting dot com
27-Mar-2005 04:22
27-Mar-2005 04:22
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 01:41
02-Dec-2004 01:41
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