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A modern dictionary of Catholic terms, both common and obscure. Find accurate definitions of words and phrases.

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EPACT

The term applied to the surplus days of the solar year over the year of twelve lunar months, or the moon's age in days on the first day of a year. The system of epacts is used to determine the time of the ecclesiastical new moon on which the date of Easter is based.

All items in this dictionary are from Fr. John Hardon's Modern Catholic Dictionary, © Eternal Life. Used with permission.

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