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    Re: Moon's 4SD
    From: Alexandre Eremenko
    Date: 2006 Nov 3, 01:39 -0500

    
    Bill,
    
    > For ALT are you using Hc?
    
    It does not matter. You can use even eye estimate for the
    ALT. The influence of this term is small.
    Even tounding to 10 degrees will not affect the result.
    
    > At what time and place is the moon
    > SD published in the almanac determined?
    > 12:00:00 at Greenwich? Meridian passage at Greenwich?
    
    I also asked myself this question. There is no answer
    in the Almanac.
    But then when I wrote the exact formula
    after Frank's hint, and compared with
    the Almanac, I realized that Moon's SD in the almanac is
    a very rough estimate,
    which seems to be always less than the true value,
    so I lost interest to
    this question. I wonder what do they include it for.
    
    Alex.
    
    
    
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