The date of Easter has long been a subject of dispute. It was one of the issues at the Synod of Whitby, which took place in 664. This year, Easter is particularly early. The Orthodox Easter and the Jewish Passover are a month later. This discrepancy dates back to 1582 and the replacement of the Julian calendar by the more accurate Gregorian calendar. The Orthodox churches mostly retained the Julian calendar, which is now twelve days late. Thus they are celebrating Christmas when everyone else is celebrating the Feast of the Epiphany. Only occasionally do the two occur at the same time. The western churches fix Easter Sunday to the first Sunday after the first full moon following the vernal equinox, the latter being on 19th, 20th or 21st March. If a full moon occurs just before the vernal equinox, an additional lunar month is effectively inserted before Easter, which will then occur at a late date and correspond with the Orthodox Easter and the Jewish Passover. It would in principle...
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