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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.
On This Day; BBC: On This Day; The New York Times: On This Day; Library of Congress: Today in History; History Channel (US): This Day in History; History Channel (UK): This Day in History; New Zealand Government: Today in New Zealand History Archived 2017-04-14 at the Wayback Machine; Computer History Museum: This Day in History
A calendar date is a reference to a particular day represented within a calendar system. The calendar date allows the specific day to be identified. The number of days between two dates may be calculated. For example, "25 January 2025" is ten days after "15 January 2025". The date of a particular event depends on the observed time zone.
August 27 is the 239th day of the year ... in the Gregorian calendar; 126 days remain until the end of the year. Events ... On This Day "Historical Events on August ...
April 10 is the 100th day of the year ... in the Gregorian calendar; 265 days remain until the end of the year. Events ... On This Day; Historical Events on April 10 ...
The Islamic calendar or Hijri calendar is a lunar calendar consisting of 12 lunar months in a year of 354 or 355 days. It is used to date events in most of the Muslim countries (concurrently with the Gregorian calendar) and used by Muslims everywhere to determine the proper day on which to celebrate Islamic holy days and festivals.
Their meetings with Queen Elizabeth II at Balmoral Castle were the Queen's final official duties before her death two days later. [ 13 ] 2022 – Russo-Ukrainian War : Ukraine begins its Kharkiv counteroffensive , surprising Russian forces and retaking over 3,000 square kilometers of land, recapturing the entire Kharkiv Oblast west of the Oskil ...
First, he adjusted the calendar so that the vernal equinox was near March 21, where it had been during the Council of Nicaea (20 May– 25 August 325). This required removing ten days of drift. Second, he made the tabular 14th day of the moon correspond with the real full moon, removing "four days and more" of drift.