In 1928 the British Parliament enacted a measure allowing the Church of England to commemorate Easter on the first Sunday after the second Saturday in April.
Despite these steps toward a consolidation, Easter continues to be a “movable” feast.
The Eastern churches, however, which did not adopt the Gregorian calendar, commemorate Easter on a Sunday either preceding or following the date observed in the West.
Since 1752, when the Gregorian calendar was also adopted in Great Britain and Ireland, Easter has been celebrated on the same day in the Western part of the Christian world.
[Photos: Full Moon Captivates Skywatchers in February 2012] Following these rules, we find that the date of Easter can fall as early as March 22 and as late as April 25.
Pope Gregory XIII decreed this in 1582 as part of the Gregorian calendar.
The council unanimously ruled that the Easter festival should be celebrated throughout the Christian world on the first Sunday after the full moon following the vernal equinox; and that if the full moon should occur on a Sunday, and thereby coincide with the Passover festival, Easter should be commemorated on the following Sunday.
As a result of the Council of Nicea, and amended by numerous subsequent meetings, the formal church deliberately attempted to design a formula for “Easter” which would any possibility of it falling on the Jewish Passover, even accidentally!