NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Computaion of table of offsets
From: Andrés Ruiz
Date: 2007 Oct 31, 12:09 +0100
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From: Andrés Ruiz
Date: 2007 Oct 31, 12:09 +0100
George in [NavList 3710] illustrate the problem with good examples.
All is based in differential geometry of the curves of altitude.
A circle of equal altitude on the surface of The Earth, is a curve of altitude on a Mercator chart, and the approximation to this curve near the position of the observer is the osculating circle, which have the radius R specified in the computation of table of offsets in Bowditch
The straight line of position in the altitude – intercept method is tangent to this osculating circle.
For more information about the basis:
http://en.wikipedia.org/wiki/Osculating_circle
Andrés Ruiz
Navigational Algorithms
http://www.geocities.com/andresruizgonzalez
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