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    Re: Deriving the Bygrave equations
    From: Geoffrey Kolbe
    Date: 2018 Feb 10, 06:36 -0800

    Hello Bob

    The Bygrave equations are basically a re-writing of the standard equations of spherical trigonometry. There are plenty of books which derive the standard equations of spherical trig and any number of online sites too. Once you are happy you understand how the standard equations of spherical trig are derived, I can show you how to go from there to the Bygrave equations.

    Geoffrey Kolbe

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