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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 Julian calendar was ... The Gregorian calendar was introduced as a refinement of the Julian calendar in 1582, and is today in ... 'brightest calendar'), created ...

  4. 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 The Julian Calendar would remain the standard in the western world for over 1600 years, until superseded by the Gregorian Calendar in 1582.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 ...

  5. Why do we have Leap Year? A guide to the calendar's bonus day

    www.aol.com/why-leap-guide-calendars-bonus...

    The creators of the Julian calendar decided to reform the calendar and catch up to the extra fourth of a day by creating 12 months, with one extra month, Mensis Intercolaris, occasionally added in ...

  6. 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.

  7. 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 ...

  8. Inter gravissimas - Wikipedia

    en.wikipedia.org/wiki/Inter_gravissimas

    Gregory XIII was elected pope on 13 May 1572 (in terms of the Julian calendar). "Anno à Natiuitate Domini nostri Iesu Christi Millesimo Quingentesimo Octuagesimo secundo" (In the year from the Nativity of our Lord Jesus Christ 1582) is the year beginning 25 December 1581 using the modern 1 January beginning of the year.

  9. 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 ...