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    Re: Math behind horizontal sextant angles
    From: John Simmonds
    Date: 1997 Mar 04, 06:33 EST

    On Mon, 3 Mar 1997 12:11:22 -0800, Geoff Kuenning wrote:
    [snip]
    >Can anybody point me to a reference work where I could look up a
    >proof or derivation?  (Please don't say "the old Bowditch" because I
    >don't have one, and you'll make me kick myself for not buying it
    >before they cut the size in half.)
    Geoff,
    Basically, Bowditch is the only reference I can name off the top of
    my head re the math for calculating the position of the centre of a
    COP from hrz sxt angles, but the formula is very basic ....
                    L = S / 2 / SIN T
    where	T is hrz angle
            S is distance between marks
            L is radius of COP passing through both marks
    Hope this helps,
    John
    
    =====================================
    He who has never been lost is no navigator
    =====================================
    

       
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