复活节的复活复活复活日期不会是每年的同一天。Prior to A.D. 325 Easter was variously celebrated on 节手节手节日different days of the week including Friday Saturday and Sunday. In that year the Council of Nicaea was convened by emperor Constantine. It issued the Easter Rule which states that Easter shall be celebrated on the first Sunday that occurs after the first full moon on or after the vernal equinox. However a caveat must be introduced here. The full moon in the rule is the ecclesiastical full moon which is defined as the fourteenth day of a tabular lunation where day 1 corresponds to the ecclesiastical New Moon. It does not always occur on the same date as the astronomical full moon. The ecclesiastical vernal equinox is always on March 21. Therefore Easter must be celebrated on a Sunday between the dates of March 22 and April 25.
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