Epact

(e'pakt.) [From Gr. epaktos, additional.] (Chron.) The moon's age at the end of the year; or the number of days by which the last new moon has preceded the commencement of the year. The annual E. is 11 days, or the exce of the common solar year above the lunar; the first being 365 days, the latter 354 days. The monstrual E. is the exce of the civil calendar month above the lunar month. See CALENDAR and GOLDEN NUMBER. [s. 333]