The Calendr

1st January 1st March 24th February 29 days adjustment adopted Aloysius Lilius altered ancient April ascertained astronomical Augustus Battle of Actium Caesar calendar date calendrial century Christ Christian chronology Church civil Clavius commencement computed correction correspondence cycle of 19 cycle of Epacts Cyrenius date of Easter December Dionysius Dominical Letter Easter date ecclesiastical Egyptian embolismic months employed enumeration Epact fact festival fixed full moon Golden Numbers Greek Gregorian Calendar Gregorian reform Herod Ides Indiction instrument of dating intercalary month intercalation intervals Josephus Julian Calendar Julius July Kalends leap day length line of Epacts Lunar Almanac lunar cycle lunation luni-solar Macrobius Mercedonius Metonic cycle months of 30 Nisan observance occurs Olympiad Paschal Passover period Pridie Idus pridie Kalendas Pridie Nonas Quartadeciman reason reckoning reference Roman Rome rule Sabbath seven-day week Sextilis solar cycle solstices Sunday tropical twelve-month vernal equinox VIII week day ΙΟ