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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. Danny Biasone - Wikipedia

    en.wikipedia.org/wiki/Danny_Biasone

    Biasone successfully lobbied the NBA to institute the shot clock in 1954. With Syracuse Nationals general manager Leo Ferris, Biasone was responsible for establishing the NBA shot clock at 24 seconds, where it has remained to this day. [1] He supported the 24-second rule on the basis of his observations, experience, and basic arithmetic.

  4. Shot clock - Wikipedia

    en.wikipedia.org/wiki/Shot_clock

    The NCAA introduced a 45-second shot clock for the 1985-86 season; [13] several conferences had experimented with it for the two seasons prior. [14] It was reduced to 35 seconds in the 1993–94 season, [15] and 30 seconds in the 2015–16 season. [16] The NAIA also reduced the shot clock to 30 seconds starting in 2015–16. [17]

  5. Unit of time - Wikipedia

    en.wikipedia.org/wiki/Unit_of_time

    One quintillionth of a second. femtosecond: 10 −15 s: One quadrillionth of a second. Pulse time on fastest lasers. svedberg: 10 −13 s: Time unit used for sedimentation rates (usually of proteins). picosecond: 10 −12 s: One trillionth of a second. nanosecond: 10 −9 s: One billionth of a second. Time for molecules to fluoresce. shake: 10 ...

  6. Shortt–Synchronome clock - Wikipedia

    en.wikipedia.org/wiki/Shortt–Synchronome_clock

    [1] [14] The secondary clock had a mechanical escapement using a 15 tooth count wheel which was moved forward each right-hand pendulum swing by a pawl attached to the pendulum. Every 15 oscillations (30 seconds), this escapement released a gravity lever which gave the secondary pendulum a push. As it fell, the secondary pendulum's gravity lever ...

  7. Orders of magnitude (time) - Wikipedia

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

    Clock time and calendar time have duodecimal or sexagesimal orders of magnitude rather than decimal, e.g., a year is 12 months, and a minute is 60 seconds. The smallest meaningful increment of time is the Planck timeā€•the time light takes to traverse the Planck distance, many decimal orders of magnitude smaller than a second. [1]

  8. Hexadecimal time - Wikipedia

    en.wikipedia.org/wiki/Hexadecimal_time

    A hexadecimal clock-face (using the Florence meridian) Hexadecimal time is the representation of the time of day as a hexadecimal number in the interval [0, 1). The day is divided into 10 16 (16 10) hexadecimal hours, each hour into 100 16 (256 10) hexadecimal minutes, and each minute into 10 16 (16 10) hexadecimal seconds.

  9. Unix time - Wikipedia

    en.wikipedia.org/wiki/Unix_time

    In the theoretical case when a negative leap second occurs, no ambiguity is caused, but instead there is a range of Unix time numbers that do not refer to any point in UTC time at all. A Unix clock is often implemented with a different type of positive leap second handling associated with the Network Time Protocol (NTP). This yields a system ...