Looking for on-line service for Sunrise time precise calculation
Category: Science > Astronomy
Asked by: prague_boy-ga
List Price: $5.00
14 Jul 2006 17:47 PDT
Expires: 13 Aug 2006 17:47 PDT
Question ID: 746469
I need calculation of some previous (15th April 2006) sunrise time in some location on Earth, but with one second precision for this caltulated time. I know coordinates of such place with half second accuracy, let's say W 81 deg.16'25,5" / N 23 deg 9'2". I'm not asking for direct equation, but rather the on-line service URL, which can give me such accurate calculation. I found few services, but sometimes the position is entered with only degrees and minutes or the calculated time is only hours and minutes. I need something better and more accurate. Thank you very much for help!
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Re: Looking for on-line service for Sunrise time precise calculation
From: gschneider-ga on 24 Jul 2006 13:12 PDT
http://www.csgnetwork.com/sunriseset.html should do the trick for you. However, a note of caution. For this degree of precision the differential effects of atmospheric refraction can make a difference with a dependence upon the temperature/pressure (and thus refractive index) profile along the line-of-site to the Sun. E.g. relevant to that comment see: http://nicmosis.as.arizona.edu:8000/ECLIPSE_WEB/ECLIPSE_86/ECLIPSE_86.html Cheers, -GS-
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