EPACT

Epact

The epact has been described as the age of the moon in days on January 1, and occurs primarily in connection with tabular methods for determining the date of Easter. It varies from year to year, because of the difference between the solar year of 365-366 days and the lunar year of 354-355 days.

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epact

Noun

  1. the time (number of days) by which a solar year exceeds twelve lunar months; it is used in the calculation of the date of Easter


The above text is a snippet from Wiktionary: epact
and as such is available under the Creative Commons Attribution/Share-Alike License.

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