The epact (Latin: epactae, from Ancient Greek: ἐπακται ἡμεραι epaktai hēmerai 'added days') was originally the term used by medieval computists for the age of a phase of the Moon, in days since the new moon, as determined on 22 March of a given year. In the newer Gregorian calendar, however, the epact is reckoned as the age of the ecclesiastical moon on 1 January.
The epact (Latin: epactae, from Ancient Greek: ἐπακται ἡμεραι epaktai hēmerai 'added days') was originally the term used by medieval computists for the age of a phase of the Moon, in days since the new moon, as determined on 22 March of a given year. In the newer Gregorian calendar, however, the epact is reckoned as the age of the ecclesiastical moon on 1 January.
Source: Wikipedia "Epact" · CC BY-SA 4.0
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