Next message: Lu Abel: "Re: Azimuth and Declination formulae"
> 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?
