Difference between revisions of "Epact"
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Revision as of 00:35, January 11, 2008
The epact is the surplus days of the solar year beyond the twelve lunar months. Alternatively, it is the moon's age (in days) on the first day of the new year.
The date of Easter is determined based on the time of the ecclesiastical new moon, which in turn is based on the system of epacts.