Get Out Your Telescope, We're Figuring Out Why Easter's Always A Different Date
Briefly

Easter changes each year due to its dependence on the Paschal Full Moon, which follows the spring equinox. Unlike holidays with set dates, Easter's date can vary significantly, influenced by ecclesiastical calculations made by the Christian Church. The Church has a fixed date for the spring equinox (March 21) and for the Paschal Full Moon, which may not align with actual astronomical events. Consequently, while Easter always falls on a Sunday, its exact day can fluctuate widely based on these established ecclesiastical rules.
Easter is a movable feast determined by the first Sunday after the Paschal Full Moon, complicating its date each year and relying on ecclesiastical dates.
The Christian Church has established ecclesiastical dates that can differ from astronomical events, adding complexity to determining Easter's date each year.
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