The Mayans employed three calendars, all organised as hierarchies of cycles of days of various lengths. The Long Count was the principal calendar for historical. Calendar Converter. Welcome to Fourmilab's calendar converter! There is no leap year rule; 3. No attempt is made to. Moon. Kenneth Seidelmann (ed.). Offering a range of services including standard Internet access and broadband including ADSL. Product and contact details available.Explanatory Supplement to. Astronomical Almanac .
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