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    Re: Old style lunar
    From: Frank Reed CT
    Date: 2004 Dec 10, 01:31 EST
    Fred, you wrote:
    "The only one that's somewhat serious is Nov 14, 1778, and that's out by
    25" of arc.  This can't explain discrepancies of 1 degree of arc!"
     
    Maybe I should have mentioned that I simply picked a few dates totally at random, to give a taste for the sorts of discrepancies you might find... some days very close, other days significantly out of line, and I should add with no periodicity (which would be easy to correct).
     
    Here's what Maskelyne has to say about the matter in the preface to the Nautical Almanac that year:
    "These new tables [...] seem to give always the Moon's longitude in the Heavens correctly within 45 seconds of a degree; which greatest error, added to the possible error of one minute in taking the Moon's distance from the Sun or a star at sea, will at a medium produce an error of 50 minutes of longitude".
     
    Frank R
    [ ] Mystic, Connecticut
    [X] Chicago, Illinois
       
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