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Detail of the tomb of Pope Gregory XIII celebrating the introduction of the Gregorian calendar. Pope Gregory XIII is best known for commissioning the Gregorian calendar , initially authored by the physician/astronomer Aloysius Lilius [ 6 ] [ 7 ] and aided by Jesuit priest/astronomer Christopher Clavius , who made the final modifications.
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.
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 adoption of the Gregorian Calendar has taken place in the history of most cultures and societies around the world, marking a change from one of various traditional (or "old style") dating systems to the contemporary (or "new style") system – the Gregorian calendar – which is widely used around the world today. Some states adopted the ...
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]
1582 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 Gregorian calendar. This year saw the beginning of the Gregorian calendar switch , when the papal bull Inter gravissimas introduced the Gregorian calendar, adopted by Spain, Portugal, the ...
For explanation, see the article about the Gregorian calendar. Except where stated otherwise, the transition was a move by the civil authorities from the Julian to the Gregorian calendar. In religious sources it could be that the Julian calendar was used for a longer period of time, in particular by Protestant and Eastern Orthodox churches. The ...
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) Pope Gregory XII (1406–1415) Pope Gregory XIII (1572–1585), after whom the Gregorian calendar is named; Pope Gregory XIV (1590–1591)