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Q: Looking for on-line service for Sunrise time precise calculation ( No Answer,   1 Comment )
Subject: Looking for on-line service for Sunrise time precise calculation
Category: Science > Astronomy
Asked by: prague_boy-ga
List Price: $5.00
Posted: 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!

Request for Question Clarification by pafalafa-ga on 14 Jul 2006 18:43 PDT
This one looks like it will do the trick:

but in order to run it, you must first install the Yahoo Widgets program:

Let me know if that works for you.

There is no answer at this time.

Subject: Re: Looking for on-line service for Sunrise time precise calculation
From: gschneider-ga on 24 Jul 2006 13:12 PDT

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:


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