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  2. International Atomic Time - Wikipedia

    en.wikipedia.org/wiki/International_Atomic_Time

    The United States Naval Observatory began the A.1 scale on 13 September 1956, using an Atomichron commercial atomic clock, followed by the NBS-A scale at the National Bureau of Standards, Boulder, Colorado on 9 October 1957. [9] The International Time Bureau (BIH) began a time scale, T m or AM, in July 1955, using both local caesium clocks and ...

  3. List of atomic clocks - Wikipedia

    en.wikipedia.org/wiki/List_of_atomic_clocks

    Printable version; In other projects ... This is a list of some experimental laboratory atomic clocks worldwide. ... Deep Space Atomic Clock [30] 2019-2021

  4. Doomsday Clock - Wikipedia

    en.wikipedia.org/wiki/Doomsday_Clock

    Before January 2020, the two tied-for-lowest points for the Doomsday Clock were in 1953 (when the Clock was set to two minutes until midnight, after the U.S. and the Soviet Union began testing hydrogen bombs) and in 2018, following the failure of world leaders to address tensions relating to nuclear weapons and climate change issues. In other ...

  5. Atomic scientists adjust 'Doomsday Clock' closer than ever to ...

    www.aol.com/news/atomic-scientists-adjust...

    Atomic scientists on Tuesday moved their "Doomsday Clock" closer to midnight than ever before, citing Russian nuclear threats amid its invasion of Ukraine, tensions in other world hot spots ...

  6. Atomic clock - Wikipedia

    en.wikipedia.org/wiki/Atomic_clock

    The development of atomic clocks has led to many scientific and technological advances such as precise global and regional navigation satellite systems, and applications in the Internet, which depend critically on frequency and time standards. Atomic clocks are installed at sites of time signal radio transmitters. [103]

  7. Leap second - Wikipedia

    en.wikipedia.org/wiki/Leap_second

    Screenshot of the UTC clock from time.gov during the leap second on 31 December 2016.. A leap second is a one-second adjustment that is occasionally applied to Coordinated Universal Time (UTC), to accommodate the difference between precise time (International Atomic Time (TAI), as measured by atomic clocks) and imprecise observed solar time (), which varies due to irregularities and long-term ...

  8. List of UTC timing centers - Wikipedia

    en.wikipedia.org/wiki/List_of_UTC_timing_centers

    Joint Atomic Time Commission P.R. China Lintong 1988 JV Justervesenet Norway Kjeller JV 2003 KEBS Kenya Bureau of Standards Kenya Nairobi KEBS 2012 2019 KRIS Korea Research Institute of Standards and Science (KRISS), Rep. of Korea Daejeon KSRI KRISS 1988 KZ Kazakhstan Institute of Standardization and Metrology Kazakhstan Astana KazStandard 2008

  9. Caesium standard - Wikipedia

    en.wikipedia.org/wiki/Caesium_standard

    The first caesium clock was built by Louis Essen in 1955 at the National Physical Laboratory in the UK [1] and promoted worldwide by Gernot M. R. Winkler of the United States Naval Observatory. Caesium atomic clocks are one of the most accurate time and frequency standards, and serve as the primary standard for the definition of the second in ...

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