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    Re: Finding great circle apex?
    From: David Pike
    Date: 2019 Jan 17, 12:31 -0800

    Tony

    Further to my earlier post this evening, the little grey cells (lgc) are waking up again.  I see I misled you slightly.  I actually needed to find the co lat of the point where the GC lies E/W before finding the longitude where it occurred, so that's what you were looking for (I think). Please see the bottom of page 4 and the top of page 5 in the photos below, but please don’t ask me to explain.  The lgc are not that far awake yet. DaveP

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