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  2. List of atomic clocks - Wikipedia

    en.wikipedia.org/wiki/List_of_atomic_clocks

    Deep Space Atomic Clock [30] 2019-2021 Hg ion Jet Propulsion Laboratory; La Cañada Flintridge, California

  3. List of Hogan's Heroes episodes - Wikipedia

    en.wikipedia.org/wiki/List_of_Hogan's_Heroes...

    Hogan and LeBeau meet up with British POW Captain Michaels (Michael St. Clair), who has just escaped from Stalag 5. Michaels arrives in a stolen truck that contains a computerized German gun-sight. Hogan hopes to send Michaels and the gun-sight to London. London reports to Hogan that the escape sub is out of commission. Hogan comes up with a plan.

  4. Atomic clock - Wikipedia

    en.wikipedia.org/wiki/Atomic_clock

    An atomic clock is a clock that measures time by monitoring the resonant frequency of atoms. It is based on atoms having different energy levels . Electron states in an atom are associated with different energy levels, and in transitions between such states they interact with a very specific frequency of electromagnetic radiation .

  5. NIST-F1 - Wikipedia

    en.wikipedia.org/wiki/NIST-F1

    NIST-F1 is a cesium fountain clock, a type of atomic clock, in the National Institute of Standards and Technology (NIST) in Boulder, Colorado, and serves as the United States' primary time and frequency standard. The clock took fewer than four years to test and build, and was developed by Steve Jefferts and Dawn Meekhof of the Time and ...

  6. Quartz clock - Wikipedia

    en.wikipedia.org/wiki/Quartz_clock

    Standard-quality 32 768 Hz resonators of this type are warranted to have a long-term accuracy of about six parts per million (0.0006%) at 31 °C (87.8 °F): that is, a typical quartz clock or wristwatch will gain or lose 15 seconds per 30 days (within a normal temperature range of 5 to 35 °C or 41 to 95 °F) or less than a half second clock ...

  7. Radio clock - Wikipedia

    en.wikipedia.org/wiki/Radio_clock

    A modern LF radio-controlled clock. A radio clock or radio-controlled clock (RCC), and often colloquially (and incorrectly [1]) referred to as an "atomic clock", is a type of quartz clock or watch that is automatically synchronized to a time code transmitted by a radio transmitter connected to a time standard such as an atomic clock.

  8. WWVB - Wikipedia

    en.wikipedia.org/wiki/WWVB

    WWVB's Colorado location makes the signal weakest on the U.S. east coast, where urban density also produces considerable interference. In 2009, NIST raised the possibility of adding a second time code transmitter, on the east coast, to improve signal reception there and provide a certain amount of robustness to the overall system should weather or other causes render one transmitter site ...

  9. Chip-scale atomic clock - Wikipedia

    en.wikipedia.org/wiki/Chip-scale_atomic_clock

    Commercial manufacturing of these atomic clocks began in 2011. [4] The CSAC, the world's smallest atomic clock, is 4 x 3.5 x 1 cm (1.5 x 1.4 x 0.4 inches) in size, weighs 35 grams, consumes only 115 mW of power, and can keep time to within 100 microseconds per day after several years of operation.

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