date_sun_info

(PHP 5 >= 5.1.2, PHP 7, PHP 8)

date_sun_info — Returns an array with information about sunset/sunrise and twilight begin/end

Beschreibung

date_sun_info(int $timestamp, float $latitude, float $longitude): array

Parameter-Liste

timestamp: Unix timestamp.
latitude: Latitude in degrees.
longitude: Longitude in degrees.

Rückgabewerte

Returns array on successIm Fehlerfall wird false zurückgegeben.. The structure of the array is detailed in the following list:

sunrise: The timestamp of the sunrise (zenith angle = 90°35').
sunset: The timestamp of the sunset (zenith angle = 90°35').
transit: The timestamp when the sun is at its zenith, i.e. has reached its topmost point.
civil_twilight_begin: The start of the civil dawn (zenith angle = 96°). It ends at sunrise.
civil_twilight_end: The end of the civil dusk (zenith angle = 96°). It starts at sunset.
nautical_twilight_begin: The start of the nautical dawn (zenith angle = 102°). It ends at civil_twilight_begin.
nautical_twilight_end: The end of the nautical dusk (zenith angle = 102°). It starts at civil_twilight_end.
astronomical_twilight_begin: The start of the astronomical dawn (zenith angle = 108°). It ends at nautical_twilight_begin.
astronomical_twilight_end: The end of the astronomical dusk (zenith angle = 108°). It starts at nautical_twilight_end.

The values of the array elements are either UNIX timestamps, false if the sun is below the respective zenith for the whole day, or true if the sun is above the respective zenith for the whole day.

Beispiele

Beispiel #1 A date_sun_info() example


<?php
$sun_info = date_sun_info(strtotime("2006-12-12"), 31.7667, 35.2333);
foreach ($sun_info as $key => $val) {
    echo "$key: " . date("H:i:s", $val) . "\n";
}
?>

Das oben gezeigte Beispiel erzeugt folgende Ausgabe:

sunrise: 05:52:11
sunset: 15:41:21
transit: 10:46:46
civil_twilight_begin: 05:24:08
civil_twilight_end: 16:09:24
nautical_twilight_begin: 04:52:25
nautical_twilight_end: 16:41:06
astronomical_twilight_begin: 04:21:32
astronomical_twilight_end: 17:12:00

Beispiel #2 Polar night


<?php
var_dump(date_sun_info(strtotime("2017-12-21"), 90, 0));
?>

Das oben gezeigte Beispiel erzeugt folgende Ausgabe:

array(9) {
  ["sunrise"]=>
  bool(false)
  ["sunset"]=>
  bool(false)
  ["transit"]=>
  int(1513857490)
  ["civil_twilight_begin"]=>
  bool(false)
  ["civil_twilight_end"]=>
  bool(false)
  ["nautical_twilight_begin"]=>
  bool(false)
  ["nautical_twilight_end"]=>
  bool(false)
  ["astronomical_twilight_begin"]=>
  bool(false)
  ["astronomical_twilight_end"]=>
  bool(false)
}

Beispiel #3 Midnight sun


<?php
var_dump(date_sun_info(strtotime("2017-06-21"), 90, 0));
?>

Das oben gezeigte Beispiel erzeugt folgende Ausgabe:

array(9) {
  ["sunrise"]=>
  bool(true)
  ["sunset"]=>
  bool(true)
  ["transit"]=>
  int(1498046510)
  ["civil_twilight_begin"]=>
  bool(true)
  ["civil_twilight_end"]=>
  bool(true)
  ["nautical_twilight_begin"]=>
  bool(true)
  ["nautical_twilight_end"]=>
  bool(true)
  ["astronomical_twilight_begin"]=>
  bool(true)
  ["astronomical_twilight_end"]=>
  bool(true)
}

Siehe auch

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

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User Contributed Notes 4 notes

down

ELY M. ¶

10 years ago


I have been working on my own php script to get current down or up for sun and moon.   I had to add function for any places that have 24 hour sun.  



here is my code for places with 24 hour sun. 



<?php

   if ($sunrise == 0 && $sunset == 0) {

   $sunrise24 = "";

   $sunset24 = "";

   //run suninfo

   $sunup = date_sun_info(strtotime($year."-".$month."-".$day), $lat, $lon);

   }



//check if sun is up all day.

if ($sunup[sunrise] == 1 && $sunup[sunrise] == 1) {

imagecopy($sky, $sun, 60, 20, 0, 0, $sun_width, $sun_height);

imagefill($sky, 0, 0, $bluesky);

}

?>

down

nospam at nomail dot com ¶

3 years ago


maybe I am wrong, but I think

SUNFUNCS_RET_TIMESTAMP     return GMT(0) time

SUNFUNCS_RET_STRING     Return local time
SUNFUNCS_RET_DOUBLE     Return local time

down

mother at localsnow dot com ¶

11 years ago


We needed the length of the day, both sunrise to sunset and twilight to twilight for particular latitudes. Sun_info() is just the thing. We mistakenly thought 'transit' was this value, which it is not. Transit is the time of day the sun is at its zenith. To get length of day, one must perform math on the results of sun_info().

When doing math with time values, don't expect date() to do the conversion to hours:minutes:seconds. date() thinks the passed value is a time since the epoch. You will need to do your own conversion to hours:minutes:seconds, using something like the following:
<?php
function hms($val) {
// convert seconds to hours:minutes:seconds
$v=$val;
$h=intval($v/3600);
$v-=($h*3600); // subtract hours
$m=intval($v/60); 
$v-=($m*60); // subtract minutes
$s=$v % 60; // seconds remaining
if ($h<10) {$h="0".$h;}
if ($m<10) {$m="0".$m;}
if ($s<10) {$s="0".$s;}
return $h.":".$m.":".$s;
}
?>

Regarding date_sunrise() and date_sunset(), these both return values without seconds and without correction for Daylight time. Whereas sun_info() handles seconds as well as Daylight time. It even handles dates prior to the epoch correctly as negative timestamps, at least as of php 5.2.12 

For example, 
sun_info(strtotime('July 4, 1776'),47.3506,-122.6417) 
produces something like the following when using date_default_timezone_set('America/Los_Angeles') and 
date("H:i:s", $val)

sunrise: 04:20:26 [-6106016374] 
sunset: 20:09:03 [-6105959457] 
transit: 12:14:45 [-6105987915] 
civil_twilight_begin: 03:40:54 [-6106018746] 
civil_twilight_end: 20:48:35 [-6105957085] 
nautical_twilight_begin: 02:46:58 [-6106021982] 
nautical_twilight_end: 21:42:31 [-6105953849] 
astronomical_twilight_begin: 01:28:06 [-6106026714] 
astronomical_twilight_end: 23:01:23 [-6105949117] 

* * *

down

info at mobger dot de ¶

9 months ago


The relation between timestamp and geoposition is not good defined.
My try of a definition is:

date_sun_info — 
Returns an array with information about sunset/sunrise and twilight begin/end as Unix-Timestamp for the the geoposition, which must have the same (local) date as the timestamp in the parameter-block for the function `date_sun_info`.

<?php
<?php
$tStamp  = strtotime('2020-12-04');
$latitude = 50;
echo("\n");
foreach([-181,-180,0,180,360] as $longitude ) {
    foreach([-86401,-86400,-86399, -1,0,1,86399, 86400,86401] as $variTimeStamp) {

        $sunInfoList = date_sun_info(($tStamp-$variTimeStamp),$latitude, $longitude);
        $sunrise = new DateTime('@'.$sunInfoList['sunrise']);
        echo($sunInfoList['sunrise']. ' => '.$sunrise->format('H:i:s d.m.Y').' || [ '.$variTimeStamp.' // ' . $longitude.'° ]');
        echo("\n");
    }    
    echo("\n");
}

?>

You may recognize the equivalence of `[ 0 // 360° ]` and `[ 86400 // 0° ]` in the results.
The result is:
<?php
/**
1607197612 => 19:46:52 05.12.2020 || [ -86401 // -181° ]
1607197612 => 19:46:52 05.12.2020 || [ -86400 // -181° ]
1607111141 => 19:45:41 04.12.2020 || [ -86399 // -181° ]
1607111141 => 19:45:41 04.12.2020 || [ -1 // -181° ]
1607111141 => 19:45:41 04.12.2020 || [ 0 // -181° ]
1607024668 => 19:44:28 03.12.2020 || [ 1 // -181° ]
1607024668 => 19:44:28 03.12.2020 || [ 86399 // -181° ]
1607024668 => 19:44:28 03.12.2020 || [ 86400 // -181° ]
1606938194 => 19:43:14 02.12.2020 || [ 86401 // -181° ]

1607197372 => 19:42:52 05.12.2020 || [ -86401 // -180° ]
1607197372 => 19:42:52 05.12.2020 || [ -86400 // -180° ]
1607110901 => 19:41:41 04.12.2020 || [ -86399 // -180° ]
1607110901 => 19:41:41 04.12.2020 || [ -1 // -180° ]
1607110901 => 19:41:41 04.12.2020 || [ 0 // -180° ]
1607024428 => 19:40:28 03.12.2020 || [ 1 // -180° ]
1607024428 => 19:40:28 03.12.2020 || [ 86399 // -180° ]
1607024428 => 19:40:28 03.12.2020 || [ 86400 // -180° ]
1606937953 => 19:39:13 02.12.2020 || [ 86401 // -180° ]

1607154137 => 07:42:17 05.12.2020 || [ -86401 // 0° ]
1607154137 => 07:42:17 05.12.2020 || [ -86400 // 0° ]
1607067665 => 07:41:05 04.12.2020 || [ -86399 // 0° ]
1607067665 => 07:41:05 04.12.2020 || [ -1 // 0° ]
1607067665 => 07:41:05 04.12.2020 || [ 0 // 0° ]
1606981191 => 07:39:51 03.12.2020 || [ 1 // 0° ]
1606981191 => 07:39:51 03.12.2020 || [ 86399 // 0° ]
1606981191 => 07:39:51 03.12.2020 || [ 86400 // 0° ]
1606894715 => 07:38:35 02.12.2020 || [ 86401 // 0° ]

1607197301 => 19:41:41 05.12.2020 || [ -86401 // 180° ]
1607197301 => 19:41:41 05.12.2020 || [ -86400 // 180° ]
1607110828 => 19:40:28 04.12.2020 || [ -86399 // 180° ]
1607110828 => 19:40:28 04.12.2020 || [ -1 // 180° ]
1607110828 => 19:40:28 04.12.2020 || [ 0 // 180° ]
1607024353 => 19:39:13 03.12.2020 || [ 1 // 180° ]
1607024353 => 19:39:13 03.12.2020 || [ 86399 // 180° ]
1607024353 => 19:39:13 03.12.2020 || [ 86400 // 180° ]
1606937877 => 19:37:57 02.12.2020 || [ 86401 // 180° ]

1607154065 => 07:41:05 05.12.2020 || [ -86401 // 360° ]
1607154065 => 07:41:05 05.12.2020 || [ -86400 // 360° ]
1607067591 => 07:39:51 04.12.2020 || [ -86399 // 360° ]
1607067591 => 07:39:51 04.12.2020 || [ -1 // 360° ]
1607067591 => 07:39:51 04.12.2020 || [ 0 // 360° ]
1606981115 => 07:38:35 03.12.2020 || [ 1 // 360° ]
1606981115 => 07:38:35 03.12.2020 || [ 86399 // 360° ]
1606981115 => 07:38:35 03.12.2020 || [ 86400 // 360° ]
1606894638 => 07:37:18 02.12.2020 || [ 86401 // 360° ]

*/
?>

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