The date of Easter and its controversies
Fixing the date on which the Resurrection of Jesus was to be observed and celebrated triggered a major controversy in early Christianity in which an Eastern and a Western position can be distinguished. The dispute was not definitively resolved until the 8th century. In Asia Minor, Christians observed the day of the Crucifixion on the same day that Jews celebrated Passover—that is, on the 14th day of the first full moon of spring, 14 Nisan (see Jewish calendar). The Resurrection, then, was observed two days later, on 16 Nisan, regardless of the day of the week. In the West the Resurrection of Jesus was celebrated on the first day of the week, Sunday, when Jesus had risen from the dead. Consequently, Easter was always celebrated on the first Sunday after the 14th day of the month of Nisan. Increasingly, the churches opted for the Sunday celebration, and the Quartodecimans (“14th day” proponents) remained a minority. The Council of Nicaea in 325 decreed that Easter should be observed on the first Sunday following the first full moon after the spring equinox (March 21). Easter, therefore, can fall on any Sunday between March 22 and April 25.
Eastern Orthodox churches use a slightly different calculation based on the Julian rather than the Gregorian calendar (which is 13 days ahead of the former), with the result that the Orthodox Easter celebration usually occurs later than that celebrated by Protestants and Roman Catholics. Moreover, the Orthodox tradition prohibits Easter from being celebrated before or at the same time as Passover.
In the 20th century attempts were made to arrive at a fixed date for Easter, with the Sunday following the second Saturday in April specifically proposed. While this proposal has supporters, it has not come to fruition.