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  2. Doomsday Clock - Wikipedia

    en.wikipedia.org/wiki/Doomsday_Clock

    It has since been set backward 8 times and forward 17 times. The farthest time from midnight was 17 minutes in 1991, and the nearest is 90 seconds, set in January 2023. The Clock was moved to 150 seconds (2 minutes, 30 seconds) in 2017, then forward to 2 minutes to midnight in January 2018, and left unchanged in 2019. [5]

  3. Play clock - Wikipedia

    en.wikipedia.org/wiki/Play_clock

    A play clock, also called a delay-of-game timer, is a countdown clock intended to speed up the pace of the game in gridiron football.The offensive team must put the ball in play by either snapping the ball during a scrimmage down or kicking the ball during a free kick down before the time expires, or else they will be assessed a 5-yard delay of game (American football) or time count violation ...

  4. Pencil detonator - Wikipedia

    en.wikipedia.org/wiki/Pencil_detonator

    The time delay of a No. 10 varies according to the concentration of the corrosive liquid in the vial. It is widely reported that the wire thickness varied also, but in fact all used the same diameter of wire. The time delay of a No. 9 is determined solely by the thickness of the notch in the wire, the spring tension, and the temperature.

  5. History of timekeeping devices - Wikipedia

    en.wikipedia.org/wiki/History_of_timekeeping_devices

    Early versions erred by less than one minute per day, and later ones only by 10 seconds, very accurate for their time. Dials that showed minutes and seconds became common after the increase in accuracy made possible by the pendulum clock. Brahe used clocks with minutes and seconds to observe stellar positions. [112]

  6. Shot clock - Wikipedia

    en.wikipedia.org/wiki/Shot_clock

    The set amount of time for a shot clock in basketball is 24–35 seconds, depending on the league. This clock reveals how much time a team may possess the ball before attempting to score a field goal. It may be colloquially known as the 24-second clock, particularly in the NBA and other leagues where that is the duration of the shot clock. If ...

  7. Pitch clock - Wikipedia

    en.wikipedia.org/wiki/Pitch_clock

    A pitch clock displayed at Werner Park in 2015. 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.

  8. 10-second barrier - Wikipedia

    en.wikipedia.org/wiki/10-second_barrier

    In second place was Leroy Burrell who also broke the former world record, which had been his at 9.90 seconds. In third place, 0.01 seconds slower than the former world record, was Dennis Mitchell with a time of 9.91 seconds. In fourth place, breaking his own European record of 9.97 seconds, was Linford Christie with a time of 9.92 seconds.

  9. Stopwatch - Wikipedia

    en.wikipedia.org/wiki/Stopwatch

    A press of the second button then resets the stopwatch to zero. The second button is also used to record split times or lap times. When the split time button is pressed while the watch is running it allows the elapsed time to that point to be read, but the watch mechanism continues running to record total elapsed time. Pressing the split button ...

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