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    Re: Moon predictions
    From: George Huxtable
    Date: 2007 Sep 27, 20:27 +0100

    Parsa wrote-
    
    |
    | Well, I figured out where I went wrong with the moon....
    | Any guesses?
    | The same thing my physics students do... sign error!
    | Declination, declination, declination. It's more important for
    | calculated height.
    |
    | First mistake: I did not examine the almanac to note that declination
    | was decreasing, which it does in May.
    
    Careful, Parsa! When you wrote "which it does in May", what you should have
    said was "which it was doing at that time on that day in May". A few days
    later or earlier, and the Moon's declination will be shifting the other way.
    And on the same date in May next year, it will be different again. Such are
    the wanderings of the Moon's declination. It goes through a whole cycle in a
    month. Take a look at the almanac.
    
    And he added-
    
    | When I fixed everything, I was very close (about one minute) to the
    | value on my PDA.
    
    Well, I would still worry a bit about that one minute.
    
    George.
    
    contact George Huxtable at george---.u-net.com
    or at +44 1865 820222 (from UK, 01865 820222)
    or at 1 Sandy Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK.
    
    
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