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Calendar > Moon

From: B. T. Raven
Subject: Calendar > Moon
Date: Sat, 19 May 2007 07:26:49 -0500
User-agent: Thunderbird (Windows/20070221)

It's obvious that sunrise-sunset times are dependent on the observer's longitude and (to a smaller degree) latitude but is the same true (to any degree)of the times of phases of the moon? There is a two minute discrepancy between the times reported by the Naval Observatory and by emacs 21.3 Can this be explained by lat. - long. differences among the observers? I understood that phases should be dependent only on the relative positions of the centers of the sun, earth, and moon. My settings are:

 (setq calendar-latitude 45)
 (setq calendar-longitude -93)

ii) Astronomy question

In the context of describing a storm and catastrophic flooding of the North Sea coast, an English medieval chronicler says that Dec. 26, 1287 (Julian, or 1-2-1288 Gregorian) is the ninth (day of the) (i.e. two days +/- after first quarter). Emacs says it's the 13th (almost full). I was under the impression that celestial positions could be extrapolated many millenia backwards with great accuracy. Without instruments it's hard to precisely determine new and full moon but easy to tell the difference between quarter and full. Does any of you have any ideas to explain this discrepancy?


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