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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. Byzantine calendar - Wikipedia

    en.wikipedia.org/wiki/Byzantine_calendar

    Julian calendar: 8 January 2025: Byzantine calendar: ... The tabular Byzantine calendar is used to calculate the date of Easter. It dates back to AD 284, ...

  4. 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 ...

  5. Mark your 2025 calendar with dates for holidays, events and games

    www.aol.com/mark-2025-calendar-dates-holidays...

    Here is a list of 2025 holidays, special events, big games, cultural milestones and other key dates to mark on your calendar, including information on the Super Bowl and movie releases.

  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

  7. Calendar date - Wikipedia

    en.wikipedia.org/wiki/Calendar_date

    A calendar date is a reference to a particular day represented within a calendar system. The calendar date allows the specific day to be identified. The number of days between two dates may be calculated. For example, "25 January 2025" is ten days after "15 January 2025". The date of a particular event depends on the observed time zone.

  8. 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]

  9. Old New Year - Wikipedia

    en.wikipedia.org/wiki/Old_New_Year

    The Old New Year, the Orthodox New Year, also known as Ra's as-Sanah or Ras el-Seni in the Middle East, is an informal traditional holiday, celebrated as the start of the New Year by the Julian calendar. In the 20th and 21st centuries, the Old New Year falls on January 14 in the Gregorian calendar.