NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Position from crossing two circles
From: George Huxtable
Date: 2006 Jun 12, 08:38 +0100
From: George Huxtable
Date: 2006 Jun 12, 08:38 +0100
I have put together an attachment which describes a method for obtaining two positions, the possible intersections of two circles on the Earth's surface that result from simultaneous altitudes of two bodies. It includes the algebraic derivation of the method from the fundamental formulae for a spherical triangle, and a listing of the code, in bastard-Basic, by which it is implemented on my programmable pocket-calculator. It's a file of about 30k, which I have not circulated to Nav-l as an attachment, but will gladly send on as a private mailing to anyone who asks, on-list or off-list. It's not original, being derived from an article by K H Zevering in EJN vol 1 no 3, Dec 2003, but with many errors corrected. George.
