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    Re: Hc formula difference why?
    From: Herman Dekker
    Date: 2017 Nov 23, 02:52 -0800

    Celestial friends,

    Thanks for the info. Just one formula.

    I know now I only have to remember

    Hc=arcSin(Cos Ldt+Sin Ld)            (ik write then of course   CosLdt is Cos L•Cos d•Cos t  etc.)
    if L and d are contrary use -d

    HermanD

       
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