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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Old style lunar
From: Frank Reed CT
Date: 2004 Dec 10, 15:52 EST
From: Frank Reed CT
Date: 2004 Dec 10, 15:52 EST
George H wrote:
"Doe, comparing almanac predictions with the modern JPL
ephemeris, and also comparing with actual Moon observations made at the
same period from Greenwich, shows that from mid-March to early May 1782
there was a strong cyclic monthly error in the predicted Moon's longitude."
ephemeris, and also comparing with actual Moon observations made at the
same period from Greenwich, shows that from mid-March to early May 1782
there was a strong cyclic monthly error in the predicted Moon's longitude."
In general, the error does not appear to be cyclic, though it can appear
cyclic for short intervals. If it had been genuinely cyclic, it would have been
an easy matter to correct it.
Frank R
[ ] Mystic, Connecticut
[X] Chicago, Illinois
[ ] Mystic, Connecticut
[X] Chicago, Illinois