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  2. Atomic clock - Wikipedia

    en.wikipedia.org/wiki/Atomic_clock

    The most accurate caesium clocks based on the caesium frequency of 9.19 GHz have an accuracy between 10 −15 –10 −16. Unfortunately, they are big and only available in large metrology labs and not useful for factories or industrial environments that would use an atomic clock for GPS accuracy but cannot afford to build a whole metrology ...

  3. Network Time Protocol - Wikipedia

    en.wikipedia.org/wiki/Network_Time_Protocol

    v. t. e. The Network Time Protocol (NTP) is a networking protocol for clock synchronization between computer systems over packet-switched, variable- latency data networks. In operation since before 1985, NTP is one of the oldest Internet protocols in current use. NTP was designed by David L. Mills of the University of Delaware.

  4. History of timekeeping devices - Wikipedia

    en.wikipedia.org/wiki/History_of_timekeeping_devices

    The most accurate pendulum clocks were controlled electrically. [166] The Shortt–Synchronome clock, an electrical driven pendulum clock designed in 1921, was the first clock to be a more accurate timekeeper than the Earth itself. [167] A succession of innovations and discoveries led to the invention of the modern quartz timer.

  5. John Harrison - Wikipedia

    en.wikipedia.org/wiki/John_Harrison

    John Harrison (3 April [ O.S. 24 March] 1693 – 24 March 1776) was an English carpenter and clockmaker who invented the marine chronometer, a long-sought-after device for solving the problem of how to calculate longitude while at sea. Harrison's solution revolutionized navigation and greatly increased the safety of long-distance sea travel.

  6. New atomic clock claims title of world's most accurate - AOL

    www.aol.com/news/2009-04-16-new-atomic-clock...

    You may have thought that the previous world's most accurate clock was good at keeping time, but it's apparently nothing compared to this new strontium atomic clock developed by scientists at the ...

  7. 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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