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  2. Repeater (horology) - Wikipedia

    en.wikipedia.org/wiki/Repeater_(horology)

    The half-quarter repeater can sound the time to half a quarter hour, or 7 + 1 ⁄ 2 minutes. It strikes hours and then quarter hours, like the quarter repeater, then it uses a single tone in order to signal if more than half of the current quarter hour has passed.

  3. Clock management - Wikipedia

    en.wikipedia.org/wiki/Clock_management

    In college football & Texas high school football, the clock restarts upon the snap of the ball when the clock was stopped with less than 2:00 left in either half. The NFL rule is the same as in the college game for the first half of games, but the clock restarts upon the snap when there is under 5:00 left in the 4th quarter/overtime. In high ...

  4. History of timekeeping devices - Wikipedia

    en.wikipedia.org/wiki/History_of_timekeeping_devices

    Huygens first used a clock to calculate the equation of time (the difference between the apparent solar time and the time given by a clock), publishing his results in 1665. The relationship enabled astronomers to use the stars to measure sidereal time , which provided an accurate method for setting clocks.

  5. Traditional Chinese timekeeping - Wikipedia

    en.wikipedia.org/wiki/Traditional_Chinese...

    Since then, kè has been used as shorthand to talk about time in 1 ⁄ 8 of a double hour or 1 ⁄ 4 of a single hour. Their usage is similar to using "quarter hour" for 15 minutes or "half an hour" for 30 minutes in English. For example, 6:45 can be written as "6 diǎn, 3 kè" (六点 三 刻; 六點 三 刻). Miǎo is now the standard term ...

  6. Date and time representation by country - Wikipedia

    en.wikipedia.org/wiki/Date_and_time...

    Whether the 24-hour clock, 12-hour clock, or 6-hour clock is used. Whether the minutes (or fraction of an hour) after the previous hour or until the following hour is used in spoken language. The punctuation used to separate elements in all-numeric dates and times. Which days are considered the weekend.

  7. 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 ...

  8. Clock won't stop after most first downs in college football ...

    www.aol.com/sports/clock-wont-stop-most-first...

    The clock has stopped after all first downs in college football games for over 50 years. (AP Photo/John Raoux) (ASSOCIATED PRESS) Some significant clock changes are coming to college football.

  9. 24-hour clock - Wikipedia

    en.wikipedia.org/wiki/24-hour_clock

    24-hour digital clock in Miaoli HSR station. A public 24-hour clock in Curitiba, Brazil, with the hour hand on the outside and the minute hand on the inside.. 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 ...