date_sunrise

(PHP 5)

date_sunriseReturns time of sunrise for a given day and location

Descrizione

mixed date_sunrise ( int $timestamp [, int $format = SUNFUNCS_RET_STRING [, float $latitude = ini_get("date.default_latitude") [, float $longitude = ini_get("date.default_longitude") [, float $zenith = ini_get("date.sunrise_zenith") [, float $gmt_offset = 0 ]]]]] )

date_sunrise() returns the sunrise time for a given day (specified as a timestamp) and location.

Elenco dei parametri

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.

Valori restituiti

Returns the sunrise time in a specified format on success o FALSE in caso di fallimento.

Errori/Eccezioni

Ogni chiamata a una funzione data/ora genera un E_NOTICE se il time zone non è valido, e/o un messaggio E_STRICT o E_WARNING se si usano le impostazioni di sistema o la variabile d'ambiente TZ. Vedere anche date_default_timezone_set()

Log delle modifiche

Versione Descrizione
5.1.0

Ora emette gli errori time zone E_STRICT e E_NOTICE

Esempi

Example #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_STRING38.4, -9901);

?>

Il precedente esempio visualizzerà qualcosa simile a:

Mon Dec 20 2004, sunrise time : 08:54

Vedere anche:

  • date_sunset() - Returns time of sunset for a given day and location

add a note add a note

User Contributed Notes 5 notes

up
3
djwice at [the same] dot com
9 years ago
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
up
1
Anonymous
7 months ago
Don't forget that inside the arctic and antarctic circles the sun never sets/rises for part of the year so this function legitimately returns false!
up
0
fingers at 4tfingers dot info
6 years ago
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
up
-1
scottix at gmail dot com
11 months ago
If you are working in multiple timezones getting the offset from a date is a little tricky because you need it in hours.

<?php

$time
= new DateTime('now', new DateTimeZone('America/Los_Angeles'));

date_sunrise(
$time->getTimestamp(),
SUNFUNCS_RET_TIMESTAMP,
38.4,
-
9,
90,
$time->getOffset() / 3600
);
up
-1
jonathanNO dot kuhnSPAM at gmailNOSPAM dot com
4 years ago
After some searching, I finally found a website that can calculate the sun's zenith. Just look up your city's lat/long (remember, west/south are negative even if it doesn't show where you look up the lat/long) and the time of sunrise/sunset and use this site:

http://solardat.uoregon.edu/cgi-bin/SolarPositionCalculator.cgi

You have to enter in the sunrise/sunset times separately, but it works.
San Diego is:
Lat: 32.73
Long: -117.17
Sunrise Z.: 90.7379
Sunset Z.: 90.8880
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