Why Does Easter Move

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Easter, unlike Christmas is a movable holiday. Easter falls on the first Sunday after the first ecclesiastical moon after the vernal equinox. There are some differences between a full moon and an ecclesiastical moon. Generally these two fall on the same day, but this was not the case in 1876. When pope Gregory the XIII standardized the calendar in 1582 the primary reason was to get Easter back in synchronization with the calendar (10 days in October had to be entirely skipped). According to Butchers algorithm Easter can fall between March 22nd and April 25th