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  2. List of time periods - Wikipedia

    en.wikipedia.org/wiki/List_of_time_periods

    Early modern period – The chronological limits of this period are open to debate. It emerges from the Late Middle Ages (c. 1500), demarcated by historians as beginning with the fall of Constantinople in 1453, in forms such as the Italian Renaissance in the West, the Ming dynasty in the East, and the rise of the Aztecs in the New World.

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

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

    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 .

  4. Unit of time - Wikipedia

    en.wikipedia.org/wiki/Unit_of_time

    1.44 minutes, or 86.4 seconds. Also marketed as a ".beat" by the Swatch corporation. moment: 1/40 solar hour (90 s on average) Medieval unit of time used by astronomers to compute astronomical movements, length varies with the season. [4] Also colloquially refers to a brief period of time. centiday 0.01 d (1 % of a day) 14.4 minutes, or 864 ...

  5. Era - Wikipedia

    en.wikipedia.org/wiki/Era

    An era is a span of time defined for the purposes of chronology or historiography, as in the regnal eras in the history of a given monarchy, a calendar era used for a given calendar, or the geological eras defined for the history of Earth. [1] Comparable terms are Epoch, age, period, saeculum, aeon (Greek aion) [2] and Sanskrit yuga. [3]

  6. Doomsday Clock - Wikipedia

    en.wikipedia.org/wiki/Doomsday_Clock

    The farthest time from midnight was 17 minutes in 1991, and the nearest is 89 seconds, set in January 2025. [ 5 ] The Clock was moved to 150 seconds (2 minutes, 30 seconds) in 2017, then forward to 2 minutes to midnight in 2018, and left unchanged in 2019. [ 6 ]

  7. Timeline of ancient history - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_ancient_history

    The date used as the end of the ancient era is arbitrary. The transition period from Classical Antiquity to the Early Middle Ages is known as Late Antiquity.Late Antiquity is a periodization used by historians to describe the transitional centuries from Classical Antiquity to the Middle Ages, in both mainland Europe and the Mediterranean world: generally from the end of the Roman Empire's ...

  8. 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).

  9. Epoch - Wikipedia

    en.wikipedia.org/wiki/Epoch

    An epoch in astronomy is a reference time used for consistency in calculation of positions and orbits. A common astronomical epoch is J2000, which is noon on January 1, 2000, Terrestrial Time. An epoch in Geochronology is a period of time, typically in the order of tens of