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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Azimuth and Declination formulae
From: Peter Fogg
Date: 2005 Jul 20, 10:38 +1000
From: Peter Fogg
Date: 2005 Jul 20, 10:38 +1000
> From: Henry C. Halboth > A bit more complicated, but generally employed with the Time Sight is ... > > hav Z = sec ho x sec L x sin 1/2S - ho x sin 1/2S -L, where ... > > Z = azimith, named according to Latitude + meridian angle, E or W > ho = corrected altitude > L = Latitude > pd = polar distance > S = ho + L + pd Interesting. Presumably 'hav' stands for haversine, which I vaguely recall is a half sine? And 'sec' is secant? I don't know what that is. What do I need to be able to use this formula? Scientific calculators I have. Do I need tables of havesines and secants? What is the advantage of this formula?
