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Egyptian astronomer preists worked out a lunar calendar of 19 years, based on the orbit of the moon. it was adopted by the greeks, and the jews (who still use it as the liturgical calendar).
Egyptian astronomer preists worked out a solar calender, of 12 months of 30 days, with five special days at the end of the year, keyed to the flooding of the nile.
last modified 22:02 2004/11/15