Feast of the Assumption, 15 August

The Feast of the Assumption falls on the fifteenth of August, the date this rule records, and shares its origin with the Eastern Dormition, both tracing to the same fifth and sixth century Jerusalem commemorations of the end of Mary's earthly life before the two churches' later split gave each side its own theological framing. What sets the Western feast apart is not its age but a much later formal definition, when Pope Pius the Twelfth declared the bodily assumption of Mary into heaven a dogma of the Catholic faith in nineteen fifty, in the document Munificentissimus Deus, making it one of only two Marian teachings, alongside the Immaculate Conception, ever defined as dogma requiring the assent of the faithful.

The Catholic definition is notably reticent on a point Orthodox teaching states plainly, whether Mary actually died before her assumption, phrasing the dogma to cover the end of her earthly life without committing to death as opposed to some other manner of passing, a deliberate ambiguity that has been debated by Catholic theologians ever since. The feast remains one of the Catholic Church's holy days of obligation in most countries, and its date, shared exactly with the Eastern Dormition despite the different theological weight each tradition places on it, remains a visible reminder of how much older the underlying commemoration is than either church's later doctrinal statement about it.