Easter – Commemorates the Resurrection of Christ. Most joyous festival of the Christian year. The date of Easter, a movable feast, is derived from the lunar calendar: the first Sunday following the first ecclesiastical full moon on or after Mar 21— always between Mar 22 and Apr 25. The Council of Nicaea (ad 325) prescribed that Easter be celebrated on the Sunday after Passover, as that feast’s date had been established in Jesus’s time. After 1582, when Pope Gregory XIII introduced the Gregorian calendar, Orthodox Christians continued to use the Julian calendar, so Easter can sometimes be as much as five weeks apart in the Western and Eastern churches.
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