date_sun_info

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

date_sun_infoReturns an array with information about sunset/sunrise and twilight begin/end

Descrizione

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

Elenco dei parametri

timestamp

Unix timestamp.

latitude

Latitude in degrees.

longitude

Longitude in degrees.

Valori restituiti

Returns array on success o false in caso di fallimento. 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.

Log delle modifiche

Versione Descrizione
7.2.0 The calculation was fixed with regards to local midnight instead of local noon, which changes the results slightly.

Esempi

Example #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";
}
?>

Il precedente esempio visualizzerà:

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

Example #2 Polar night, with some processing

<?php
$tz
= new \DateTimeZone('America/Anchorage');

$si = date_sun_info(strtotime("2022-12-21"), 70.21, -148.51);
foreach (
$si as $key => $value) {
echo
match (
$value) {
true => 'always',
false => 'never',
default =>
date_create("@{$value}")->setTimeZone($tz)->format( 'H:i:s T' ),
},
": {$key}",
"\n";
}
?>

Il precedente esempio visualizzerà:

never: sunrise
never: sunset
12:52:18 AKST: transit
10:53:19 AKST: civil_twilight_begin
14:51:17 AKST: civil_twilight_end
09:01:47 AKST: nautical_twilight_begin
16:42:48 AKST: nautical_twilight_end
07:40:47 AKST: astronomical_twilight_begin
18:03:49 AKST: astronomical_twilight_end

Example #3 Midnight sun (Tromsø, Norway)

<?php
$si
= date_sun_info(strtotime("2022-06-26"), 69.68, 18.94);
print_r($si);
?>

Il precedente esempio visualizzerà:

Array
(
    [sunrise] => 1
    [sunset] => 1
    [transit] => 1656240426
    [civil_twilight_begin] => 1
    [civil_twilight_end] => 1
    [nautical_twilight_begin] => 1
    [nautical_twilight_end] => 1
    [astronomical_twilight_begin] => 1
    [astronomical_twilight_end] => 1
)

Example #4 Calculating length of day (Kyiv)

<?php
$si
= date_sun_info(strtotime('2022-08-26'), 50.45, 30.52);
$diff = $si['sunset'] - $si['sunrise'];
echo
"Length of day: ",
floor($diff / 3600), "h ",
floor(($diff % 3600) / 60), "s\n";
?>

Il precedente esempio visualizzerà:

Length of day: 13h 56s

add a note add a note

User Contributed Notes 4 notes

up
3
ELY M.
13 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);
}
?>
up
1
nospam at nomail dot com
5 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
up
1
mother at localsnow dot com
13 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]

* * *
up
1
info at mobger dot de
3 years 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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