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    Re: great circle distance
    From: Frank Dinkelaar
    Date: 2000 May 24, 01:35 EDT

    The explanation by Bill Trayfors is problably the same
    as was meant here.
    This is the original
    cos D = sin L1 (+ or abs. diff.) sin L2 (abs. diff) (cos L1 *
                                                     cos L2 * cos DLo)
    The confusing part here is that a difference is stated and
    this was my interpretation
     cos D =  abs(sinL1 - sinL2) - abs(cosL1 x cosL2 x cos Dlo)
    Bill change  the sign of L2 when you cross the equator
    which in the end seems to be the same as changing the sign
    between the two parts of the formula
    Thank for all the comments
    I am now going to attempt to make a program (VB) that will
    show all the course changes at the press of a button

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