date_sun_info

(PHP 5 >= 5.1.2)

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

Popis

array date_sun_info ( int $time, float $latitude, float $longitude )

Seznam parametrů

time: Timestamp.
latitude: Latitude in degrees.
longitude: Longitude in degrees.

Návratové hodnoty

Returns array on success or FALSE on failure.

Příklady

Příklad 323. 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";

}

?>

Výše uvedený příklad vypíše:


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

Viz také

date_sunrise()

date_sunset()

add a note User Contributed Notes
date_sun_info

glenbo (_AT_) mac (_DOT_) com
17-Jun-2008 12:54


It should be noted that for extreme geographical locations date_sun_info() might return unexpected values. Values of 1 or empty may be returned. If you are expecting a unix timestamp this will default to the epoch, or epoch+1, which is not what you would expect.



After researching official almanac records for these locations it appears likely that for sunrise and sunset return values of 1 relate to a situation where the sun is above the horizon for the entire 24 hour day. It is also possible that empty return values relate to a situation where the sun is below the horizon for the entire 24 hour day. In the case of twilight data a 1 probably means that the sun never dips below that zenith, and an empty value means the sun never rises above said zenith for that given day.



The following code exhibits unique dates from the northernmost city Ny-Ålesund, Svalbard, and the southernmost city McMurdo Research Station, Antarctica.



<?php



$northernmost_city_latitude = 78.92;   // Ny-Ålesund, Svalbard

$northernmost_city_longitude = 11.93;

$southernmost_city_latitude = -77.88;  // McMurdo Research Station, Antarctica

$southernmost_city_longitude = 166.73;



print_r( date_sun_info( strtotime("2008-01-01") , $northernmost_city_latitude, $northernmost_city_longitude) );

print_r( date_sun_info( strtotime("2008-04-01") , $northernmost_city_latitude, $northernmost_city_longitude) );

print_r( date_sun_info( strtotime("2008-01-01") , $southernmost_city_latitude, $southernmost_city_longitude) );

print_r( date_sun_info( strtotime("2008-06-01") , $southernmost_city_latitude, $southernmost_city_longitude) );



?>



This will return the following. Observe that sometimes a value of 1 or empty is returned. 



Array

(

    [sunrise] => 

    [sunset] => 

    [transit] => 1199186158

    [civil_twilight_begin] => 

    [civil_twilight_end] => 

    [nautical_twilight_begin] => 1199184075

    [nautical_twilight_end] => 1199188241

    [astronomical_twilight_begin] => 1199170475

    [astronomical_twilight_end] => 1199201840

)

Array

(

    [sunrise] => 1207019232

    [sunset] => 1207077865

    [transit] => 1207048548

    [civil_twilight_begin] => 1

    [civil_twilight_end] => 1

    [nautical_twilight_begin] => 1

    [nautical_twilight_end] => 1

    [astronomical_twilight_begin] => 1

    [astronomical_twilight_end] => 1

)

Array

(

    [sunrise] => 1

    [sunset] => 1

    [transit] => 1199148994

    [civil_twilight_begin] => 1

    [civil_twilight_end] => 1

    [nautical_twilight_begin] => 1

    [nautical_twilight_end] => 1

    [astronomical_twilight_begin] => 1

    [astronomical_twilight_end] => 1

)

Array

(

    [sunrise] => 

    [sunset] => 

    [transit] => 1212281461

    [civil_twilight_begin] => 

    [civil_twilight_end] => 

    [nautical_twilight_begin] => 1212273312

    [nautical_twilight_end] => 1212289609

    [astronomical_twilight_begin] => 1212264187

    [astronomical_twilight_end] => 1212298734

)

add a note

date_sunrise

date_parse

Last updated: Sat, 24 Mar 2007