One major difference between the Julian and Gregorian Calendars is the "leap year rule".See our FAQ on Calendars for a description of the difference.In the astronomical case, this full moon occurred after the equinox, but in the ecclesiastical case, it preceded the equinox.

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

The Gregorian Calendar used by most Western Christian churches is the standard international calendar for civil use.

It also regulates the ceremonial cycle of the Roman Catholic and Protestant churches.

The ecclesiastical rules that determine the date of Easter trace back to 325 CE at the First Council of Nicaea convened by the Roman Emperor Constantine.

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.

Universal adoption of this Gregorian calendar occurred slowly.