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  2. Gregorian calendar - Wikipedia

    en.wikipedia.org/wiki/Gregorian_calendar

    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.

  3. Adoption of the Gregorian calendar - Wikipedia

    en.wikipedia.org/wiki/Adoption_of_the_Gregorian...

    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.

  4. Inter gravissimas - Wikipedia

    en.wikipedia.org/wiki/Inter_gravissimas

    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.

  5. 1582 - Wikipedia

    en.wikipedia.org/wiki/1582

    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 Honnō-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 ...

  6. Timeline of the Catholic Church - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_the_Catholic...

    The History of the Catholic Church, From the Apostolic Age to the Third Millennium James Hitchcock, Ph.D. Ignatius Press, 2012 ISBN 978-1-58617-664-8; Triumph: The Power and the Glory of the Catholic Church. Crocker, H.W. Bokenkotter, Thomas. A Concise History of the Catholic Church. Revised and expanded ed. New York: Image Books Doubleday, 2005.

  7. List of adoption dates of the Gregorian calendar by country

    en.wikipedia.org/wiki/List_of_adoption_dates_of...

    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 ...

  8. Old Style and New Style dates - Wikipedia

    en.wikipedia.org/wiki/Old_Style_and_New_Style_dates

    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]

  9. Calendar (New Style) Act 1750 - Wikipedia

    en.wikipedia.org/wiki/Calendar_(New_Style)_Act_1750

    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 ...