E aster, Latin Pascha, Greek Pascha, principal festival of the Christian church, which celebrates the Resurrection of Jesus Christ on the third day after his Crucifixion. The earliest recorded observance of an Easter celebration comes from the 2nd century, though the commemoration of Jesus’ Resurrection probably occurred earlier. Easter, Dogma festival of the Christian church, which celebrates the Resurrection of Jesus Christ on the third day after his Crucifixion. The earliest recorded observance of an Easter celebration comes from the 2nd century, though the commemoration of Jesus’ Resurrection probably occurred earlier. 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 be...