Why Do We Have Leap Year?In order to keep the calendar cycle synchronized with the seasons, one extra day is (usually) added every four years as February 29th.
Definition for church-calendar (2 of 2)
a calendar based on the lunisolar cycle, used by many Christian churches in determining the dates for the movable feasts.
Also called church calendar. a calendar of the Christian year, indicating the days and seasons for fasts and festivals.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019