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date_sunset (PHP 5) date_sunset --
Returns time of sunset for a given day and location
Descriptionmixed date_sunset ( int timestamp [, int format [, float latitude [, float longitude [, float zenith [, float gmt_offset]]]]] )
date_sunset() returns the sunset time for a given day
(specified as a timestamp) and location. The
latitude, longitude and
zenith parameters default to the
date.default_latitude,
date.default_longitude and
date.sunset_zenith configuration options,
respectively.
The latitude defaults to North. So, if you want to
specify a South value, you must pass a negative value. The same note
applies to longitude, which defaults to East.
The gmt_offset parameter is specified in hours.
Таблица 1. 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 |
Пример 1. date_sunset() example |
<?php
echo date("D M d Y"). ', sunset time : ' .date_sunset(time(), SUNFUNCS_RET_STRING, 38.4, -9, 90, 1);
?>
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Результатом выполнения данного примера
будет что-то подобное: Mon Dec 20 2004, sunset time : 18:13 |
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See also date_sunrise().
date_sunset
jbr (AT) ya-right.com
19-Feb-2005 10:19
Here a function that will return an array of all valid formats, both starting and ending times!
[Editor's note: you can find that function on the docpage of date_sunrise()]
djwice at [the same] dot com
02-Dec-2004 01:39
A way to use this:
<?php
$lat = 52.10; $long = 5.18; $offset = 1; $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);
?>
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
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date_sunrise