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The date for Easter shifts every year within the Christian calendar.

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Nonetheless, different means of calculations continued in use throughout the Christian world.

In 1582, Christopher Clavius and a council working at the direction of Gregory XIII (Pope of the Roman Catholic Church) completed a reconstruction of the Julian Calendar producing new Easter tables.

At that time the Roman world used the Julian Calendar (put in place by Julius Caesar).

The Council decided to keep Easter on the same Sunday throughout the Christian world.

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The Eastern Christian churches still determine the Easter dates using the older Julian Calendar method.

The statement that Easter Day is the first Sunday after the full moon that occurs next after the vernal equinox, is only an approximate statement of the actual ecclesiastical rules.

However, a variety of practices remain among the Eastern Churches.

There are three major differences between the ecclesiastical and the astronomical systems.

For example, in 1962 the astronomical full moon occurred on March 21, UT=7h 55m - about six hours after astronomical equinox.