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reckoning time in advance
A '''calendar''' is any system that uses observations of cyclic motions of celestial bodies and/or the [[climate]] seasons on [[Earth]] to schedule or record the activities of human beings, or one that uses mathematics to approximate such observations.<ref name=Walker>Walker, John. "[http://www.fourmilab.ch/documents/calendar/ Fourmilab Calendar Converter]." Fourmilab Switzerland. Accessed April 9, 2008.</ref><ref name=France>"[http://www.imcce.fr/page.php?nav=fr/ephemerides/astronomie/Promenade/pages2/277.html Chronologie, eres, et calendriers]" (Chronology, Eras, and Calendars). [http://www.imcce.fr/imcce_en.html Institut de mécanique célèste et de calcul des éphémerides] (Institute of Celestial Mechanics and Ephemeral Calculation), Paris, [[France]]. Accessed April 9, 2008.</ref>
A '''calendar''' is any system that uses observations of cyclic motions of celestial bodies and/or the [[climate]] seasons on [[Earth]] to schedule or record the activities of human beings, or one that uses mathematics to approximate such observations.<ref name=Walker>Walker, John. "[http://www.fourmilab.ch/documents/calendar/ Fourmilab Calendar Converter]." Fourmilab Switzerland. Accessed April 9, 2008.</ref><ref name=France>"[http://www.imcce.fr/page.php?nav=fr/ephemerides/astronomie/Promenade/pages2/277.html Chronologie, eres, et calendriers]" (Chronology, Eras, and Calendars). [http://www.imcce.fr/imcce_en.html Institut de mécanique célèste et de calcul des éphémerides] (Institute of Celestial Mechanics and Ephemeral Calculation), Paris, [[France]]. Accessed April 9, 2008.</ref>
*Since their invention, calendars have been used to reckon time in advance, and to fix the occurrence of events like harvests or religious festivals.<ref> [http://www.infoplease.com/spot/gregorian1.html Information Please]</ref>
== History ==
== History ==