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  2. Julian calendar - Wikipedia

    en.wikipedia.org/wiki/Julian_calendar

    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 event during the years from 1901 through 2099, its date according ...

  3. 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

  4. Julian day - Wikipedia

    en.wikipedia.org/wiki/Julian_day

    The Julian date (JD) of any instant is the Julian day number plus the fraction of a day since the preceding noon in Universal Time. Julian dates are expressed as a Julian day number with a decimal fraction added. [8] For example, the Julian Date for 00:30:00.0 UT January 1, 2013, is 2 456 293.520 833. [9]

  5. Julian year (astronomy) - Wikipedia

    en.wikipedia.org/wiki/Julian_year_(astronomy)

    The Julian day number is a simplified time-keeping system originally intended to ease calculation with historical dates which involve a diversity of local, idiosyncratic calendars. It was adopted by astronomers in the mid-1800s, and identifies each date as the integer number of days that have elapsed since a reference date ( "epoch" ), chosen ...

  6. Old Style and New Style dates - Wikipedia

    en.wikipedia.org/wiki/Old_Style_and_New_Style_dates

    The need to correct the calendar arose from the realisation that the correct figure for the number of days in a year is not 365.25 (365 days 6 hours) as assumed by the Julian calendar but slightly less (c. 365.242 days). The Julian calendar therefore has too many leap years.

  7. List of calendars - Wikipedia

    en.wikipedia.org/wiki/List_of_calendars

    A mixture of Julian and Gregorian calendar, giving dates before 1582 in the Julian calendar, and dates after 1582 in the Gregorian calendar, counting 1 BC as year zero, and negative year numbers for 2 BC and earlier. French Republican Calendar: solar: Gregorian: 1793: First French Republic: In use in revolutionary France 1793 to 1805 ...

  8. 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 ...

  9. List of dates for Easter - Wikipedia

    en.wikipedia.org/wiki/List_of_dates_for_Easter

    The earliest dates for Easter in the Eastern Orthodox Church between 1875 and 2099 are April 4, 1915 and April 4, 2010 (Gregorian). Both dates are equivalent to 22 March in the Julian Calendar. The next earliest date for Orthodox Easter, March 23 in the Julian Calendar, last occurred in 1953, and will next occur in 2037. Both of these dates are ...

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