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RE : http://www.fer3.com/arc/m2.aspx?i=116583
[NavList] Re: Any "on line" Star Position Computation available ?
From: navigationalalgorithms---com
Date: 21 Jun 2011 08:17

Hello Andr�s, and

Hello Paul and Dave,

Yes, Andr�s, it will happen that with the quite dramatic recent changes in Astronomical Computations precepts, some software might be lagging behind in terms of being adequately maintained.

For you example, I personnally find results very close from your Meeus determination (211�40'8746 or 14h06m43s4984 vs your quoted value of "GAST = 14:06:43.49917" ) which - when compared our the most accurate current determinations (Paul, Dave ..., are U here ? What are your results for And�s'example ? ) - should be accurate to +/- 0.001s/0.015" given the fact that here I am still using the IAU 1984 Computation precepts and sources, and in particular Wahr's Nutation Theory, to their full accuracy however.

As regards the SIMBAD strange results earlier addressed here, I have received a provisional reply from CDS in Strasbourg. They acknowledge some inaccuracy for their SIMBAD results as a result from their recent shift to the HIPPARCOS 1992.25/2007 database because of a now improper Proper Motion Computation. This is right-on where you had pin-pointed it earlier last week, Paul ! It will nonetheless take some time to correct this situation :-((

Best Regards to yourself in particular Andr�s, and to all

Kermit

Antoine M. "Kermit" Cou�tte

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