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  2. Estimates of historical world population - Wikipedia

    en.wikipedia.org/wiki/Estimates_of_historical...

    Published estimates for the 1st century ("AD 1") suggest uncertainty of the order of 50% (estimates range between 150 and 330 million). Some estimates extend their timeline into deep prehistory, to " 10,000 BC", i.e., the early Holocene, when world population estimates range roughly between 1 and 10 million (with an uncertainty of up to an ...

  3. 13th century - Wikipedia

    en.wikipedia.org/wiki/13th_century

    13th century. The 13th century was the century which lasted from January 1, 1201 (represented by the Roman numerals MCCI) through December 31, 1300 (MCCC) in accordance with the Julian calendar . The Mongol Empire was founded by Genghis Khan, which stretched from Eastern Asia to Eastern Europe. The conquests of Hulagu Khan and other Mongol ...

  4. Military time zone - Wikipedia

    en.wikipedia.org/wiki/Military_time_zone

    The military time zones are a standardized, uniform set of time zones for expressing time across different regions of the world, named after the NATO phonetic alphabet. The Zulu time zone (Z) is equivalent to Coordinated Universal Time (UTC) and is often referred to as the military time zone. The military time zone system ensures clear ...

  5. List of archaeological periods (North America) - Wikipedia

    en.wikipedia.org/wiki/List_of_archaeological...

    Periods in North American prehistory. Lithic stage. before 8500 BC. Archaic period. 8000–1000 BC. Formative stage. 1000 BC – AD 500. Woodland period. 1000 BC – AD 1000.

  6. 24-hour clock - Wikipedia

    en.wikipedia.org/wiki/24-hour_clock

    24-hour digital clock in Miaoli HSR station.. A time of day is written in the 24-hour notation in the form hh:mm (for example 01:23) or hh:mm:ss (for example, 01:23:45), where hh (00 to 23) is the number of full hours that have passed since midnight, mm (00 to 59) is the number of full minutes that have passed since the last full hour, and ss (00 to 59) is the number of seconds since the last ...

  7. Hundred Years' War - Wikipedia

    en.wikipedia.org/wiki/Hundred_Years'_War

    The Hundred Years' War was a time of rapid military evolution. Weapons, tactics, army structure and the social meaning of war all changed, partly in response to the war's costs, partly through advancement in technology and partly through lessons that warfare taught. The feudal system slowly disintegrated as well as the concept of chivalry.

  8. Christianity in the Middle Ages - Wikipedia

    en.wikipedia.org/wiki/Christianity_in_the_Middle...

    After this, the common folk took a few hundred more years to convert to Christianity and their reasoning for converting was in large part due to the nobility. [8] Originally, Anglo-Saxon leaders claimed divine descent while taking part in many rituals and practices for Paganism but after their conversion they in turn became spiritual leaders ...

  9. 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 number from the "Difference" column.