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    Re: Computaion of table of offsets
    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

    radius of curvature

     

     

    Andrés Ruiz

    Navigational Algorithms

    http://www.geocities.com/andresruizgonzalez

     


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