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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 has conventionally come to be regarded as a new calendar in its own right, called the Gregorian calendar, named after Pope Gregory XIII. In the realm of orthodox christendom whose liturgical cycles did not apply the Inter gravissimas, the reformed calendar is noted as the New Style. The reformed Julian Calendar is used in most countries today, relatively independent of religious orientation of its populaces.
- ^ Inter Gravissimas Bill Spencer's (in English) translation of the Inter Gravissimas, 1999, revised 2002, based on Rodolphe Audette's transcription of the (in Latin) text. Also includes Rodolphe Audette's translation into (in French).
- ^ Inter Gravissimas prepared for ISO TC 154 (in English, Latin, and French)
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