NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: N.A. Altitude Correction Table
From: Dan Hogan
Date: 2001 Apr 27, 2:33 PM
From: Dan Hogan
Date: 2001 Apr 27, 2:33 PM
On 27 Apr 2001, at 17:41, Herbert Prinz wrote: > Dear All, > > I just realize that I don't understand the Altitude Correction Table 10� > to 90� for the Sun on page A2 in the Nautical Almanac. Well I'm no mathematician, but A2 is just a critical table you pluck a number from. > Does anybody know whether the exact formula (algorithm) that generates > this table has been published? I can't seem to reproduce it with the > calculator formulas given in the Almanac itself. Nor is it consistent > with the results I get when I correct the sun observation for refraction > by means of the star table and then apply horizontal parallax and > average SD according to season... What am I missing? Don't know where the exact formula would be, but the book that mos navigation programmers refer to is "Astronomical Algorithms by Jean Meeus ISBN 0-943396- 35-2",printed in the US by William-Bell, Inc. > Best regards > > Herbert Prinz (from 1368950/-4603950/4182550 ECEF) > > P.S. > > Speaking of the sun: Has anybody on the list observed it in the last few > days? Quite remarkable. Clouds Cheers -Dan-
