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  2. Julian calendar - Wikipedia

    en.wikipedia.org/wiki/Julian_calendar

    In other words, the Julian calendar gains 3.1 days every 400 years. Gregory's calendar reform modified the Julian rule, to reduce the average length of the calendar year from 365.25 days to 365.2425 days and thus corrected the Julian calendar's drift against the solar year: the Gregorian calendar gains just 0.1 day over 400 years. For any given ...

  3. History of calendars - Wikipedia

    en.wikipedia.org/wiki/History_of_calendars

    The Roman calendar was reformed by Julius Caesar in 45 BC. The Julian calendar was no longer dependent on the observation of the new moon but simply followed an algorithm of introducing a leap day every four years. This created a dissociation of the calendar month from the lunation.

  4. List of calendars - Wikipedia

    en.wikipedia.org/wiki/List_of_calendars

    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 ...

  5. Dionysius Exiguus - Wikipedia

    en.wikipedia.org/wiki/Dionysius_Exiguus

    Dionysius Exiguus’ Paschal table owes its strong structure to his distant predecessor Anatolius, who invented the Metonic 19-year lunar cycle, which is an application of the Metonic cycle in the Julian calendar. [17]

  6. Inter gravissimas - Wikipedia

    en.wikipedia.org/wiki/Inter_gravissimas

    The first page of the papal bull 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.

  7. Adoption of the Gregorian calendar - Wikipedia

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

    Some religious groups in some of these countries, known as Old Calendarists, still use the "old style" (O.S.) Julian calendar for ecclesiastical purposes. The Kingdom of Bulgaria changed from the Julian to the Gregorian calendar in 1916 during the First World War. 31 March was followed by 14 April 1916. [17]

  8. Gregorian calendar - Wikipedia

    en.wikipedia.org/wiki/Gregorian_calendar

    The Gregorian calendar, like the Julian calendar, is a solar calendar with 12 months of 28–31 days each. The year in both calendars consists of 365 days, with a leap day being added to February in the leap years. The months and length of months in the Gregorian calendar are the same as for the Julian calendar.

  9. 46 BC - Wikipedia

    en.wikipedia.org/wiki/46_BC

    Caesar reforms the Roman calendar to create the Julian calendar. The transitional year is extended to 445 days to synchronize the new calendar and the seasonal cycle. The Julian Calendar would remain the standard in the western world for over 1600 years, until superseded by the Gregorian Calendar in 1582. Caesar appoints his nephew Octavian his ...