Calendar Conversions Utility to convert from or to Gregorian, Julian, Jewish, or French Republican dates. Calendar Overview A table comparing the numbers of days and months in each of several calendar systems. Calendars and Their History By L. E. Doggett, reprinted from the Explanatory Supplement to the Astronomical Almanac . Origin of the Days Encyclopedia Mythica article on the origins of our English weekday names. See also Origins of the names of the months .
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