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  2. 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

  3. Timeline of the far future - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_the_far_future

    By this time, if protons do decay, the Black Hole Era, in which black holes are the only remaining celestial objects, begins. [9] [141] 3.14×10 50 (314 quindecillion) The estimated time until a micro black hole of one Earth mass today, will have decayed into subatomic particles by the emission of Hawking radiation. [147] 10 65 (100 vigintillion)

  4. Calendar year - Wikipedia

    en.wikipedia.org/wiki/Calendar_year

    The Gregorian calendar year, which is in use as civil calendar in most of the world, begins on January 1 and ends on December 31. [1] It has a length of 365 days in an ordinary year but, in order to reconcile the calendar year with the astronomical cycle, it has 366 days in a leap year. With 97 leap years every 400 years, the Gregorian calendar ...

  5. 399 - Wikipedia

    en.wikipedia.org/wiki/399

    At the time, it was known in Rome as the Year of the Consulship of Eutropius and Theodorus (or, less frequently, year 1152 Ab urbe condita). The denomination 399 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.

  6. History of calendars - Wikipedia

    en.wikipedia.org/wiki/History_of_calendars

    The Maya new year would start with 1 Pop, followed by 2 Pop, all the way through to 19 Pop, followed by the seating of the month of Uo, written as 0 Uo, then 1 Uo, 2 Uo and so on. These two cycles coincided every 52 years. The 52-year period of time was called a "bundle" and was similar to a modern-day century. [56]

  7. 360-day calendar - Wikipedia

    en.wikipedia.org/wiki/360-day_calendar

    The 360-day calendar is a method of measuring durations used in financial markets, in computer models, in ancient literature, and in prophetic literary genres.. It is based on merging the three major calendar systems into one complex clock [citation needed], with the 360-day year derived from the average year of the lunar and the solar: (365.2425 (solar) + 354.3829 (lunar))/2 = 719.6254/2 ...

  8. Calendar - Wikipedia

    en.wikipedia.org/wiki/Calendar

    A full calendar system has a different calendar date for every day. [20] [21] Thus the week cycle is by itself not a full calendar system; [22] neither is a system to name the days within a year without a system for identifying the years. The simplest calendar system just counts time periods from a reference date. [23]

  9. Anno Mundi - Wikipedia

    en.wikipedia.org/wiki/Anno_Mundi

    Anno Mundi (from Latin "in the year of the world"; Hebrew: לבריאת העולם, romanized: Livryat haOlam, lit. 'to the creation of the world'), abbreviated as AM or A.M., or Year After Creation, [1] is a calendar era based on the biblical accounts of the creation of the world and subsequent history. Two such calendar eras of notable use are: