From: Werner LEMBERG (email@example.com)
Date: Tue Oct 12 2004 - 15:26:16 CST
> But for certain purposes e.g. historical astronomical calculations
> (used for establishing chronology from records of eclipses etc) the
> year numbers used are effectively negative numbers (and zero) AD.
Well, astronomers normally convert everything to Julian Day (JD)
numbers, starting at January 1st, -4712 (this is -4713 BC), 12h.
Today we have JD 2453291.
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