Inter gravissimas
Papal document that established the Gregorian calendar / From Wikipedia, the free encyclopedia
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Inter gravissimas (English: "Among the most serious...") was a papal bull issued by Pope Gregory XIII on 24 February 1582.[1][2] The document, written in Latin, reformed the Julian calendar. The reform came to be regarded as a new calendar in its own right and came to be called the Gregorian calendar, which is used in most countries today.