NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Math behind horizontal sextant angles
From: John Simmonds
Date: 1997 Mar 04, 06:33 EST
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
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He who has never been lost is no navigator
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