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    Re: Calculating the time when GHA is equals zero?
    From: Tony Oz
    Date: 2020 Mar 21, 00:08 -0700

    Dear Steve,

    Happy New Year! (The Sun is in the northern hemisphere since 2020-03-20UT03:50)

    As of my favourite official Almanac - it is the Air Almanac (also found here), because it tabulates for every 10 minutes of time one can get away with the GHA/Dec interpolation by simply timing his sights to the tabulated moments.

    My actually preferred Nautical Almanac is a DIY project by Erik De Man who publishes very aesthetically-pleasing tables along with the work-sheets for several sight reduction methods. My favourite pen-and-paper SR method is the All-Haversine Doniol (yet to be covered by Erik) but looks like he will include that too.

    Warm regards,
    Tony
    60°N 30°E

       
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