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    Re: Finding great circle apex?
    From: Andrés Ruiz
    Date: 2019 Jan 18, 08:54 +0100
    My application ChartWork plots the GC route, the nodes, the vertices and the mid point. Uses this vector approach:

    Vector Solutions for Great Circle Navigation. Michael A. Earle.
    THE JOURNAL OF NAVIGATION Volume 58, Issue 03, September 2005, pp 451-457. The Royal Institute of Navigation
    doi:10.1017/S0373463305003358 

    Regards,
    --
    Andrés Ruiz
    Navigational Algorithms
    http://sites.google.com/site/navigationalalgorithms/

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