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  2. 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 ...

  3. History of calendars - Wikipedia

    en.wikipedia.org/wiki/History_of_calendars

    The ancient Athenian calendar was a lunisolar calendar with 354-day years, consisting of twelve months of alternating length of 29 or 30 days. To keep the calendar in line with the solar year of 365.242189 days, an extra, intercalary month was added in the years: 3, 6, 8, 11, 14, 17, 19 of the 19-years Metonic cycle.

  4. List of decades, centuries, and millennia - Wikipedia

    en.wikipedia.org/wiki/List_of_decades,_centuries...

    See calendar and list of calendars for other groupings of years. See history , history by period , and periodization for different organizations of historical events. For earlier time periods, see Timeline of the Big Bang , Geologic time scale , Timeline of evolution , and Logarithmic timeline .

  5. Perpetual calendar - Wikipedia

    en.wikipedia.org/wiki/Perpetual_calendar

    A perpetual calendar is a calendar valid for many years, usually designed to look up the day of the week for a given date in the past or future. For the Gregorian and Julian calendars, a perpetual calendar typically consists of one of three general variations: Fourteen one-year calendars, plus a table to show which one-year calendar is to be ...

  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. Calendar era - Wikipedia

    en.wikipedia.org/wiki/Calendar_era

    A calendar era is the period of time elapsed since one epoch of a calendar and, if it exists, before the next one. [1] For example, the current year is numbered 2025 in the Gregorian calendar, which numbers its years in the Western Christian era (the Coptic Orthodox and Ethiopian Orthodox churches have their own Christian eras).

  8. It's your last chance to shop the 50 best Advent calendars of ...

    www.aol.com/lifestyle/the-best-advent-calendars...

    Some of the year's best Advent calendars still have a little inventory left. ... Unlike previous years, this calendar comes with pieces from all 25 years of Star Wars lore, from the AT-AT featured ...

  9. Gregorian calendar - Wikipedia

    en.wikipedia.org/wiki/Gregorian_calendar

    Although the calendar year currently runs from 1 January to 31 December, at previous times year numbers were based on a different starting point within the calendar (see the "beginning of the year" section below).