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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.
The Gregorian calendar is the calendar used in most parts of the world. [1] [a] It went into effect in October 1582 following the papal bull Inter gravissimas issued by Pope Gregory XIII, which introduced it as a modification of, and replacement for, the Julian calendar.
After Pope Pius V (1566–1572) died, the conclave chose Cardinal Boncompagni, who assumed the name of Gregory XIII in homage to Gregory the Great, a 6th-century reforming pope. It was a very brief conclave, lasting less than 24 hours.
The Julian calendar ended up being 11 minutes and 14 seconds longer than the tropical year — the time it takes for seasons to repeat. In the late 16th century, Pope Gregory XIII improved the ...
Enter Pope Gregory XIII, who calibrated further. His Gregorian calendar took effect in the late 16th century. It remains in use today and, clearly, isn’t perfect or there would be no need for ...
Wednesday, 2 September 1752, was followed by Thursday, 14 September 1752. In Great Britain, the term "New Style" was used for the calendar and the Act omits any acknowledgement of Pope Gregory: the Annexe to the Act established a computation for the date of Easter that achieved the same result as Gregory's rules, without actually referring to him.
Pope Gregory I (Latin: Gregorius I; c. 540 – 12 March 604), commonly known as Saint Gregory the Great, was the 64th Bishop of Rome from 3 September 590 to his death. [1] [a] He is known for instituting the first recorded large-scale mission from Rome, the Gregorian mission, to convert the then largely pagan Anglo-Saxons to Christianity. [2]
The Liber beatae Gregorii papae ('book of the blessed Pope Gregory'), often known in English as the Anonymous Life of Gregory the Great, is a hagiography of Pope Gregory I composed by an anonymous monk or nun at a Northumbrian monastery, usually thought to have been at Whitby, around 700.