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Re: Sunrise/Sunset Algorithm [message #88368 is a reply to message #88367]

Thu, 17 April 2014 09:00

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

nata writes:

> Does anybody have an algorithm to calculate the sunrise and sunset of a given lat/lon position and date?
>
> I tried to use the following algorithm: williams.best.vwh.net/sunrise_sunset_algorithm.htm
>
> but when I compare with the results of NOAA I have big differences
> http://www.esrl.noaa.gov/gmd/grad/solcalc/sunrise.html

I'm guessing the Ray Sterner routines at the JHUAPL IDL library is about
as good as they get:

http://www.idlcoyote.com/gallery/index.html#SUN_TERMINATOR_P LOT

Cheers,

David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
Sepore ma de ni thue. ("Perhaps thou speakest truth.")

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[Message index]

		Sunrise/Sunset Algorithm By: natha on Thu, 17 April 2014 08:52
		Re: Sunrise/Sunset Algorithm By: David Fanning on Thu, 17 April 2014 09:00
		Re: Sunrise/Sunset Algorithm By: natha on Thu, 17 April 2014 10:21
		Re: Sunrise/Sunset Algorithm By: wlandsman on Thu, 17 April 2014 11:42
		Re: Sunrise/Sunset Algorithm By: natha on Thu, 17 April 2014 11:43
		Re: Sunrise/Sunset Algorithm By: skymaxwell@gmail.com on Fri, 25 April 2014 08:42
		Re: Sunrise/Sunset Algorithm By: hwljn on Sun, 12 February 2017 00:33

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