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Historically, most calendar reforms have been made in order to synchronize the calendar with the astronomical year (either solar or sidereal) and/or the synodic month in lunar or lunisolar calendars. Most reforms for calendars have been to make them more accurate. This has happened to various lunar and lunisolar calendars, and also the Julian ...
The Gregorian reform shortened the average (calendar) year by 0.0075 days to stop the drift of the calendar with respect to the equinoxes. [3] Second, in the years since the First Council of Nicaea in AD 325, [ b ] the excess leap days introduced by the Julian algorithm had caused the calendar to drift such that the March equinox was occurring ...
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 ...
The bull, canons, and calendars were reprinted as part of the principal book explaining and defending the Gregorian calendar, Christoph Clavius, Romani calendarii a Gregorio XIII. P. M. restituti explicatio (1603), [5] which is tome V in his collected works Opera Mathematica (1612).
This is a list of calendars.Included are historical calendars as well as proposed ones. Historical calendars are often grouped into larger categories by cultural sphere or historical period; thus O'Neil (1976) distinguishes the groupings Egyptian calendars (Ancient Egypt), Babylonian calendars (Ancient Mesopotamia), Indian calendars (Hindu and Buddhist traditions of the Indian subcontinent ...
List of adoption dates of the Gregorian calendar by country; List of Gregorian Jewish-related and Israeli holidays; List of Gregorian Palestinian-related observances; M.
The following pages, corresponding to the Gregorian calendar, list the historical events, births, deaths, and holidays and observances of the specified day of the year: Jan 1
See Public holidays in the Republic of Ireland. In Poland during holidays on 1 and 3 May, when taking a few days of leave can result in 9-day-long holidays; this is called The Picnic (or Majówka). In Japan, golden-week lasts roughly a full week. Then, in 2007, the law was amended so that if any 2 public holidays occur both on a weekday and are ...