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    Re: GMT of lunar altitudes when possible?
    From: Herman Dekker
    Date: 2019 Jul 10, 09:15 -0700

    Frank, thank you for the explanation.
    I had to degrade to this method, because this week when, for the first time, I tried to shoot a lunar, but my stiff neck gave problems.
    I could see the sun at ~60° hight with pain in the neck, so I quitted. I know now why I love the A-12 bubble sextant, for sun and moon
    you can look down without neckpain. So have to degrade to Lunar altitudes.

    Forget old Rule: Moon should be near the prime vertical

    Correct Rule to remember:
    The moon horns must be horizontal or max 45° tilted from the horizontal.
    (I believe I have never seen horizontal horns, on my latitude 52°N, but at home only Altitudes above 10° are visible)


    But what with a full moon? Is it usefull on xx:00 hour to Precompute Moons Hc1 and again say xx:15 hour for Moons Hc2.
    Subtract  Hc2 from Hc1 and divide the answer bij 15, this gives the change in altitude per minute.
    Again question rises what is minimum alt/min change for resonabele result on my Latitude 52°N?

    Well next days are forecasted cloudy, so have to wait for a trial.

    regards

    HermanD. 52°N 04°E


       
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