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    Re: T Hav Doniol Sumner LOP Example
    From: Herman Dekker
    Date: 2018 Sep 9, 23:23 -0700

    Greg,

    Nice example, for me this is the first time I see a sumner line (never studied it).
    I looks pretty simple, No plottingsheet needed. I begin to understand why Frank
    promotes this method.
    With using the hav table I had one doubt, the hav value is connected on two angles
    For instance hv 0.1521 has 14°10'  and 345°50', but if I remember correct t is
    always < 90° so I have tot use the smallest angle?
    I have to make markings in the table, to be sure I take the correct minutes column.
    Top degrees with left minutes column, and bottem degrees with right minutes column.

    greetings from Holland

    HermanD 52°N 04°W

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