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    Re: Moonrise over Connecticut, 19 October 2021
    From: Herman Dekker
    Date: 2021 Oct 24, 03:20 -0700

    Frank gave the info HE= 17ft. From we can calc the dip.   Dip=0.97'·√HE(ft)=4'

    But is there one formula for calculating how far the distance is from the observer to the visible horizon?

    The normal formula for a rectangular triangle Distance= HE / tg(angle) wil give a approximation
    but I suppose there is one better formula, that include the curvature of the earth?

    regards
    HermanD

       
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