Early Calendars

Gregorian Calendar

Other Calendar Systems

Native American Calendar Systems

Among the Indians who lived in the Western Hemisphere before the arrival of Christopher Columbus, the most complex calendars were those developed by the Maya and Aztec peoples.

The basic structure of the Maya calendar is common to all calendars of ancient Mexico and Central America. It consisted of a ritual cycle of 260 named days and a year of 365 days. These cycles, which ran concurrently, formed a longer cycle of 18,980 days, or…

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Three Kinds of Year

Months, Weeks, and Days