XML Feed for determining daylight hours

Does anyone know of a feed for determining what time it gets light and dark based on post code or longitude latitude coordinates. We need it for use in a booking system to avoid bookin开发者_如何学Cgs after dark.

Any ideas?

Marvellous

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Odd booking system. Anyway, the BBC weather feed gives you sunset and sunrise times. Its in RSS.

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You can use EarthTools Sunrise and Sunset Times webservice to get sunrise/sunset times and calculate daylight with them (XML format):

http://www.earthtools.org/sun/latitude/longitude/day/month/timezone/dst

Sunrise and sunset times are calculated using a PHP script using formulae from www.srrb.noaa.gov. There might be errors when using latitudes which are close to the poles.

As @Tomasz wrote another way is to use local computation. For example there is easy to use LuckyCat Labs Sunrise/Sunset Java Library for Java (RubySunrise Gem for Ruby is also available).

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There are plenty of resources over the Internet:

• C# Sunrise/Sunset with latitude/longitude - SO
• http://www.weatherimages.org/latlonsun.html
• http://www.ga.gov.au/geodesy/astro/sunrise.jsp

You don't need a web-service, this is a matter of moderately complicated program (earth is more or less just a spinning ball) which you can run locally.

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A few years old of a question, but php has built-in functions to get this data.

$reldate=new DateTime();
$reldate->modify('+'.$dayp.' days');
$today['SUNR']=date_sunrise($reldate->format('U'), SUNFUNCS_RET_STRING, 39.36, -74.60, 90.583333, -4);
$today['SUNS']=date_sunset ($reldate->format('U'), SUNFUNCS_RET_STRING, 39.36, -74.60, 90.583333, -4);