We are all aware that Easter is a “moveable feast” that can fall on various calendar dates, unlike Christmas which falls on a fixed date. The reason for these seemingly arbitrary and meandering dates is a bit complicated, but the formula that the Vatican now uses only came to be a standard across Catholicism in the 9th Century, after hundreds of years of regional variations gave way to the superior [what came to be known as] the Alexandrian formula.
The formula was necessary to reckon the Roman calendar – a purely solar calendar – with the full moon and the astronomical timing of Passover, and creating a sacred temporal pattern unique to Roman versions of Christianity.
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