Epact n. (Chron.) The moon's age at the beginning of the calendar year, or the number of days by which the last new moon has preceded the beginning of the year.
Annual epact, the excess of the solar year over the lunar year, being eleven days.
Menstrual epact, or Monthly epact, the excess of a calendar month over a lunar.
... of May of the bissextile year one thousand nine hundred and four of the christian era (jewish era five thousand six hundred and sixtyfour, mohammadan era one thousand three hundred and twentytwo), golden number 5, epact 13, solar cycle 9, dominical letters C B, Roman indiction 2, Julian ... — Ulysses • James Joyce
... seven Hathors, and five days in the epact—and the Radiant Three. To me it seemeth ... — The Yoke - A Romance of the Days when the Lord Redeemed the Children - of Israel from the Bondage of Egypt • Elizabeth Miller
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