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  2. Countdown - Wikipedia

    en.wikipedia.org/wiki/Countdown

    In the context of a rocket launch, the "L minus Time" is the physical time before launch, e.g. "L minus 3 minutes and 40 seconds". "T minus Time" is a system to mark points at which actions necessary for the launch are planned - this time stops and starts as various hold points are entered, and so doesn't show the actual time to launch.

  3. Three-minute warning - Wikipedia

    en.wikipedia.org/wiki/Three-minute_warning

    In Canadian football, the three-minute warning is given when three minutes of game time remain on the game clock in the first and second halves of a game. (If the ball is in play when the clock reaches 3:00, the three-minute warning is given immediately after the ball is declared dead.) The three-minute warning stops the game clock in all cases.

  4. Timer - Wikipedia

    en.wikipedia.org/wiki/Timer

    A timer or countdown timer is a type of clock that starts from a specified time duration and stops upon reaching 00:00. An example of a simple timer is an hourglass. Commonly, a timer triggers an alarm when it ends. A timer can be implemented through hardware or software. Stopwatches operate in the opposite direction, upwards from 00:00 ...

  5. Year 2038 problem - Wikipedia

    en.wikipedia.org/wiki/Year_2038_problem

    The problem exists in systems which measure Unix time—the number of seconds elapsed since the Unix epoch (00:00:00 UTC on 1 January 1970)—and store it in a signed 32-bit integer. The data type is only capable of representing integers between −(2 31 ) and 2 31 − 1 , meaning the latest time that can be properly encoded is 2 31 − 1 ...

  6. STS-36 - Wikipedia

    en.wikipedia.org/wiki/STS-36

    26 Feb 1990, 12:54:00 am: Scrubbed: 1 day 0 hours 54 minutes: Weather: 26 Feb 1990, 2:30 am (T−00:09:00 hold) Clouds were present at the Shuttle Landing Facility. A 48-hour turnaround was issued to allow the crew to rest. [4]: 2 6: 28 Feb 1990, 2:50:22 am: Success: 2 days 1 hour 56 minutes: The countdown was held at T−5 minutes to assess ...

  7. 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 ...

  8. STS-61-C - Wikipedia

    en.wikipedia.org/wiki/STS-61-C

    The mission lasted a total of 6 days, 2 hours, 3 minutes, and 51 seconds. STS-61-C was the last successful Space Shuttle flight before the Challenger disaster, which occurred on January 28, 1986, only 10 days after Columbia ' s return.

  9. 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]

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