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  2. Pitch clock - Wikipedia

    en.wikipedia.org/wiki/Pitch_clock

    Pitch clock. A pitch clock (also known as a pitch timer) [1] is used in various baseball leagues to limit the amount of time a pitcher uses before he throws the ball to the hitter and/or limit the amount of time the hitter uses before he is prepared to hit. Various baseball leagues and tournaments around the world have started using a pitch ...

  3. Orders of magnitude (time) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude_(time)

    The smallest meaningful increment of time is the Planck time―the time light takes to traverse the Planck distance, many decimal orders of magnitude smaller than a second. [1] The largest realized amount of time, based on known scientific data, is the age of the universe , about 13.8 billion years—the time since the Big Bang as measured in ...

  4. Doomsday Clock - Wikipedia

    en.wikipedia.org/wiki/Doomsday_Clock

    Doomsday Clock. The Doomsday Clock is a symbol that represents the likelihood of a human-made global catastrophe, in the opinion of the members of the Bulletin of the Atomic Scientists. [1] Maintained since 1947, the clock is a metaphor, not a prediction, for threats to humanity from unchecked scientific and technological advances.

  5. Shot clock - Wikipedia

    en.wikipedia.org/wiki/Shot_clock

    A shot clock is a countdown timer used in a variety of games and sports, indicating a set amount of time that a team may possess the object of play before attempting to score a goal. Shot clocks are used in several sports including basketball, water polo, canoe polo, lacrosse, poker, ringette, korfball, tennis, ten-pin bowling, and various cue ...

  6. Unit of time - Wikipedia

    en.wikipedia.org/wiki/Unit_of_time

    A unit of time is any particular time interval, used as a standard way of measuring or expressing duration. The base unit of time in the International System of Units (SI), and by extension most of the Western world, is the second, defined as about 9 billion oscillations of the caesium atom. The exact modern SI definition is " [The second] is ...

  7. 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 ...

  8. List of presidents of the United States by time in office ...

    en.wikipedia.org/wiki/List_of_presidents_of_the...

    40th • January 20, 1981 – January 20, 1989: Two full terms Bill Clinton: 2,922 42nd • January 20, 1993 – January 20, 2001: Two full terms George W. Bush: 2,922 43rd • January 20, 2001 – January 20, 2009: Two full terms Barack Obama: 2,922 44th • January 20, 2009 – January 20, 2017: Two full terms 14: George Washington: 2,865

  9. Clock management - Wikipedia

    en.wikipedia.org/wiki/Clock_management

    Clock management. In gridiron football, clock management is an aspect of game strategy that focuses on the game clock and/or play clock to achieve a desired result, typically near the end of a match. Depending on the game situation, clock management may entail playing in a manner that either slows or quickens the time elapsed from the game ...

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