![]() ![]() Thus calendars serve as a link between mankind and the cosmos. In addition to serving practical purposes, the process of organization provides a sense, however illusory, of understanding and controlling time itself. ![]() The common theme of calendar making is the desire to organize units of time to satisfy the needs and preoccupations of society. Some calendars are codified in written laws others are transmitted by oral tradition. Some calendars are regulated by astronomical observations, some carefully and redundantly enumerate every unit, and some contain ambiguities and discontinuities. The generality of this definition is due to the diversity of methods that have been used in creating calendars.Īlthough some calendars replicate astronomical cycles according to fixed rules, others are based on abstract, perpetually repeating cycles of no astronomical significance. Kenneth Seidelmann, editor, with permission from University Science Books, Sausalito, CA 94965.Ī calendar is a system of organizing units of time for the purpose of reckoning time over extended periods.īy convention, the day is the smallest calendrical unit of time the measurement of fractions of a day is classified as timekeeping. Doggett Reprinted from the Explanatory Supplement to the Astronomical Almanac, P. ![]()
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