Jisho

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Wikipedia definition
1. EpactThe epact was originally defined 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 (usually by 11 days) from year to year, because of the difference between the solar year of 365 days and the lunar year of 354 days.
Read “Epact” on English Wikipedia
Read “エパクト” on Japanese Wikipedia
Read “Epact” on DBpedia

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