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    Re: Moon's 4SD
    From: Bill B
    Date: 2006 Nov 02, 17:13 -0500

    Alex wrote
    
    > The real value depends on the Moon's altitude and it
    > is given by approximate formula
    >
    > SD=0.27277HP(1+sin(HP)sin(ALT)),
    >
    > where HP is the Moon Horizontal Equatorial Parallax
    > (rightmost column of the Moon section of the daily page)
    > and ALT is the Moon altitude.
    > The second term is non-negligible if we talk about 0.1'
    > precision!
    
    For ALT are you using Hc?
    
    At what time and place is the moon SD published in the almanac determined?
    12:00:00 at Greenwich? Meridian passage at Greenwich?
    
    Bill
    
    
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