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    Re: Cosine formula to solve a right spherical triangle?
    From: Ed Popko
    Date: 2020 Jan 26, 04:36 -0800

    Frank's great circle analogy with a tunnel between two points on earth and projecting its midpoint and other tunnel points to the surface of the earth (from the center of the earth) is really a nice visualization.

    It's somewhat surprising that if the tunnel points are all equally spaced and prjected, the arc distances between great circle points near mid-tunnel points are much larger than arc distances near the tunnel's endpoints.

    Ed

       
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