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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Position from crossing two circles : was [NAV-L] Reality check
From: Michael Dorl
Date: 2006 Jun 8, 08:48 -0500
From: Michael Dorl
Date: 2006 Jun 8, 08:48 -0500
At 05:55 AM 6/8/2006, Herbert Prinz wrote: >Actually, there is no rigorous method of advancing the circle of equal >altitude, but an approximate solution can still be had. Since one has a good idea of the course and speed between any two observations, it seems to me the problem is to determine points on the equal altitude circles separated by that vector. >How this is to >be done properly was shown by A'Hearn and Rossano in Navigation, Journal >of the Institute of Navigation, Spring 1977, Vol. 24. For the simple >case where both altitudes are taken simultaneously, see S. Howell, >Practical Celestial Navigation. Other variants of solutions to the >combined altitude problem (by Kotlaric, Dozier, etc.) are described in >editions of Bowditch of the late 60s to 80s. I saw some variant of the Bowditch treatment with the reference to Dozier but the one I saw was very sketchy and incomplete. I never did find anything by Dozier.
