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  2. Julian calendar - Wikipedia

    en.wikipedia.org/wiki/Julian_calendar

    Julian calendar. The Julian calendar is a solar calendar of 365 days in every year with an additional leap day every fourth year (without exception). The Julian calendar is still used as a religious calendar in parts of the Eastern Orthodox Church and in parts of Oriental Orthodoxy as well as by the Amazigh people (also known as the Berbers).

  3. Old Style and New Style dates - Wikipedia

    en.wikipedia.org/wiki/Old_Style_and_New_Style_dates

    [6] [d] (Scotland had already made this aspect of the changes, on 1 January 1600.) [7] [8] The second (in effect [e]) adopted the Gregorian calendar in place of the Julian calendar. Thus "New Style" can refer to the start-of-year adjustment, to the adoption of the Gregorian calendar, or to the combination of the two. It was through their use in ...

  4. History of calendars - Wikipedia

    en.wikipedia.org/wiki/History_of_calendars

    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. Sub-Saharan African calendars can vary in days and weeks depending on the kingdom or tribe that created it.

  5. Revised Julian calendar - Wikipedia

    en.wikipedia.org/wiki/Revised_Julian_calendar

    The number of days per Revised Julian cycle = 900 × 365 + 218 = 328,718 days. Taking mod 7 leaves a remainder of 5, so like the Julian calendar, but unlike the Gregorian calendar, the Revised Julian calendar cycle does not contain a whole number of weeks. Therefore, a full repetition of the Revised Julian leap cycle with respect to the seven ...

  6. Conversion between Julian and Gregorian calendars - Wikipedia

    en.wikipedia.org/wiki/Conversion_between_Julian...

    No guidance is provided about conversion of dates before March 5, -500, or after February 29, 2100 (both being Julian dates). For unlisted dates, find the date in the table closest to, but earlier than, the date to be converted. Be sure to use the correct column. If converting from Julian to Gregorian, add the number from the "Difference" column.

  7. 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.

  8. List of calendars - Wikipedia

    en.wikipedia.org/wiki/List_of_calendars

    The Canopic reform of 238 BC introduced the leap year every fourth year later adopted in the Julian calendar. The reform eventually went into effect with the introduction of the "Alexandrian calendar" (or Julian calendar) by Augustus in 26/25 BC, which included a 6th epagomenal day for the first time in 22 BC. Julian calendar: solar: Roman: 45 BC

  9. Calendar (New Style) Act 1750 - Wikipedia

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

    The Calendar (New Style) Act 1750 (24 Geo. 2. c. 23), also known as Chesterfield's Act or (in American usage) the British Calendar Act of 1751, is an Act of the Parliament of Great Britain. Its purpose was for Great Britain and the British Empire to adopt the Gregorian calendar (in effect). [c] The Act also changed the start of the legal year ...