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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.
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.
In the territory of modern Ukraine, the Gregorian calendar was officially adopted for secular use immediately after its adoption by Pope Gregory XIII in 1582, as most of Ukraine then was part of the predominantly Catholic Polish-Lithuanian Commonwealth. The Roman Catholic Church in Ukraine switched to the new calendar at the same time.
October 15: The day after October 4, 1582, is designated October 15 by order of Pope Gregory XIII June 21: Japanese warlord Oda Nobunaga assassinated in "incident at HonnÅ-ji" 1582 ( MDLXXXII ) was a common year starting on Monday in the Julian calendar , and a common year starting on Friday (link will display full calendar) of the Proleptic ...
At Jefferson's birth, the difference was eleven days between the Julian and Gregorian calendars and so his birthday of 2 April in the Julian calendar is 13 April in the Gregorian calendar. Similarly, George Washington is now officially reported as having been born on 22 February 1732, rather than on 11 February 1731/32 (Julian calendar). [26]
Pope Gregory III (731–741) Pope Gregory IV (827–844) Pope Gregory V (996–999) Pope Gregory VI (1045–1046) Antipope Gregory VI; Pope Gregory VII (1073–1085), after whom the Gregorian Reform is named; Pope Gregory VIII (1187) Antipope Gregory VIII; Pope Gregory IX (1227–1241) Pope Gregory X (1271–1276) Pope Gregory XI (1370–1378 ...
The Gregorian calendar was a reform of the Julian calendar, instituted by Pope Gregory XIII in 1582 by the papal bull " Inter gravissimas" ("Among the most serious "). The intention expressed by the text of this bull was to reset the calendar so that celestial events critical for the calculation of Easter dates—the March equinox and its ...