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Re: Old style lunar
From: Frank Reed CT
Date: 2004 Dec 9, 20:35 EST
From: Frank Reed CT
Date: 2004 Dec 9, 20:35 EST
Alex wrote:
"Perhaps Frank can also tell us what accuracy can be expected
from his lunar "predictions" for 200 years ago."
from his lunar "predictions" for 200 years ago."
+/- 1 arcsecond or better.
Here's a specific sample from the 1778 Nautical Almanac (N.A.) compared
with my online lunars predictions (modern ephemeris). Angles in degrees,
minutes, and seconds, dd.mm.ss:
Noon, March 20, 1778
Sun-Moon distance from N.A.: 65.19.52
Modern ephemeris: 65.19.58
Noon, June 18, 1778
Sun-Moon distance from N.A.: 84.02.18
Modern ephemeris: 84.02.04
Noon, August 25, 1778
Sun-Moon distance from N.A.: 39.49.12
Modern ephemeris: 39.49.17
Noon, November 14, 1778
Sun-Moon distance from N.A.: 52.37.19
Modern ephemeris: 52.37.44
There is also a complete Nautical Almanac from 1804 at the Mystic Seaport
Library web site with all of the preducted lunar distances from that year if you
want to do some more comparisons.
Frank R
[ ] Mystic, Connecticut
[X] Chicago, Illinois
[ ] Mystic, Connecticut
[X] Chicago, Illinois
