Catholic Dictionary
Find accurate definitions of over 5,000 Catholic terms and phrases (including abbreviations). Based on Fr. John Hardon's Modern Catholic Dictionary, © Eternal Life. Used with permission.
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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.
