NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Out of Date Almanac
From: Gary LaPook
Date: 2009 Dec 7, 22:51 -0800
From: Gary LaPook
Date: 2009 Dec 7, 22:51 -0800
It's an exact correction to GHA Aries, check at: http://aa.usno.navy.mil/data/docs/celnavtable.php It is a constant difference between GHA Aries for 2006 and 2010 for the same dates and times. gl On Dec 7, 8:49�pm, frankr...@HistoricalAtlas.com wrote: > Gary, you wrote: > > "For the stars just add the constant of 2.1' to GHA Aries, which is exact." > > While there are corrections that can be applied for precession, this one surely isn't "exact" (you don't get the exact positions for the stars for 2010 just by applying that rule). Or did I miss your point? > > And you wrote: > > "You can avoid this whole problem by getting a copy of �Geoffrey Kolbe's > Long Term Almanac which provides accurate data until 2050." > > Yes, that's a really good option, too. > > -FER -- NavList message boards: www.fer3.com/arc Or post by email to: NavList@fer3.com To , email NavList+@fer3.com