Calendars and Their History

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http://astro.nmsu.edu/~lhuber/leaphist.html

This site reprints an essay by L. E. Doggett about the history of various calendars, including the Gregorian, the Julian, the Hebrew, the Islamic, the Indian, and the Chinese. Additionally, the essay explains the astronomical bases of calendars, calendar reform movements, and historical eras and chronologies. This site is an important first step for anyone trying to understand where calendars originate and how they are created.