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  2. Caesium standard - Wikipedia

    en.wikipedia.org/wiki/Caesium_standard

    The first set of units defined using the caesium standard were those relating to time, with the second being defined in 1967 as "the duration of 9 192 631 770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium 133 atom" meaning that: 1 second, s, = 9,192,631,770 Δt Cs

  3. NIST-F2 - Wikipedia

    en.wikipedia.org/wiki/NIST-F2

    NIST physicists Steve Jefferts (foreground) and Tom Heavner with the NIST-F2 cesium fountain atomic clock, a civilian time standard for the United States. NIST-F2 is a caesium fountain atomic clock that, along with NIST-F1, serves as the United States' primary time and frequency standard. [1] NIST-F2 was brought online on 3 April 2014. [1] [2]

  4. Unit of time - Wikipedia

    en.wikipedia.org/wiki/Unit_of_time

    The Jiffy is the amount of time light takes to travel one femtometre (about the diameter of a nucleon). The Planck time is the time that light takes to travel one Planck length. The TU (for time unit) is a unit of time defined as 1024 μs for use in engineering. The svedberg is a time unit used for sedimentation rates (usually

  5. Atomic clock - Wikipedia

    en.wikipedia.org/wiki/Atomic_clock

    BeiDou Time (BDT) is a continuous time scale starting at 1 January 2006 at 0:00:00 UTC and is synchronised with UTC within 100 ns. [129] [130] BeiDou became operational in China in December 2011, with 10 satellites in use, [131] and began offering services to customers in the Asia-Pacific region in December 2012. [132]

  6. Super Simple Songs - Wikipedia

    en.wikipedia.org/wiki/Super_Simple_Songs

    As of April 30, 2011, it is the 105th most-subscribed YouTube channel in the world and the second most-subscribed YouTube channel in Canada, with 41.4 million subscribers, and the 23rd most-viewed YouTube channel in the world and the most-viewed YouTube channel in Canada, with 49.7 billion views.

  7. Galactic year - Wikipedia

    en.wikipedia.org/wiki/Galactic_year

    The galactic year, also known as a cosmic year, is the duration of time required for the Sun to orbit once around the center of the Milky Way Galaxy. [1] One galactic year is approximately 225 million Earth years. [2]

  8. Hafele–Keating experiment - Wikipedia

    en.wikipedia.org/wiki/Hafele–Keating_experiment

    The time difference was measured by direct clock comparison at the ground before and after the flight, as well as during the flight by laser pulses of 0.1 ns duration. Those signals were sent to the plane, reflected, and again received at the ground station. The time difference was observable during the flight, before later analysis.

  9. Higher and Higher (The Moody Blues song) - Wikipedia

    en.wikipedia.org/wiki/Higher_and_Higher_(The...

    The verses of the song are spoken by Mike Pinder, rather than sung.Sound effects of a rocket launching begin the song and last for the first minute. "Higher and Higher" was also the Moody Blues' first full length song that was written by the band's drummer Graeme Edge.