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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

    Download QR code; Print/export ... This is a list of some experimental laboratory atomic clocks worldwide. ... Deep Space Atomic Clock [30] 2019-2021

  4. 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]

  5. List of UTC timing centers - Wikipedia

    en.wikipedia.org/wiki/List_of_UTC_timing_centers

    List of UTC timing centers is a list of over 70 recognized maintainers of atomic clocks around the world from which UTC is calculated. [1] Below are links to some of the more notable time centers which contribute to the calculation of UTC.

  6. Wikipedia : Public domain image resources

    en.wikipedia.org/wiki/Wikipedia:Public_domain...

    Free for personal and commercial use, no attribution required. Devostock.com – Over 160,000 free professional images for commercial use. Flickr Public Domain Search – About 6 million Public Domain images (link is to search filtered by "CC0", "No known copyright restrictions" and "U.S. Gov't Works"). Includes British Library.

  7. Atomichron - Wikipedia

    en.wikipedia.org/wiki/Atomichron

    The Atomichron was the world's first commercial atomic clock, built by the National Company, Inc. of Malden, Massachusetts. It was also the first self-contained portable atomic clock and was a caesium standard clock. More than 50 clocks with the trademarked Atomichron name were produced. [1] [2] [3] [4]

  8. An unsettling photo of a US physicist cheerfully ... - AOL

    www.aol.com/article/2016/05/16/an-unsettling...

    Related: Iconic photos from WWII: Fat Man was the second nuclear weapon to be deployed in combat after the US dropped a 5-ton atomic bomb, called " Little Boy ," on the Japanese city of Hiroshima.

  9. Time standard - Wikipedia

    en.wikipedia.org/wiki/Time_standard

    International Atomic Time (TAI) [12] is the primary physically realized time standard. TAI is produced by the International Bureau of Weights and Measures (BIPM), and is based on the combined input of many atomic clocks around the world, [13] each corrected for environmental and relativistic effects (both gravitational and because of speed ...

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