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  2. Military time zone - Wikipedia

    en.wikipedia.org/wiki/Military_time_zone

    The military time zones are a standardized, uniform set of time zones for expressing time across different regions of the world, named after the NATO phonetic alphabet. The Zulu time zone (Z) is equivalent to Coordinated Universal Time (UTC) and is often referred to as the military time zone.

  3. 24-hour clock - Wikipedia

    en.wikipedia.org/wiki/24-hour_clock

    24-hour digital clock in Miaoli HSR station. A public 24-hour clock in Curitiba, Brazil, with the hour hand on the outside and the minute hand on the inside.. A time of day is written in the 24-hour notation in the form hh:mm (for example 01:23) or hh:mm:ss (for example, 01:23:45), where hh (00 to 23) is the number of full hours that have passed since midnight, mm (00 to 59) is the number of ...

  4. Department of Defense master clock - Wikipedia

    en.wikipedia.org/wiki/Department_of_Defense...

    The master atomic clock ensemble at the U.S. Naval Observatory in Washington D.C., which provides the time standard for the U.S. Department of Defense. [1] The rack mounted units in the background are caesium beam clocks. The black units in the foreground are hydrogen maser standards.

  5. Atomic clock - Wikipedia

    en.wikipedia.org/wiki/Atomic_clock

    Atomic clocks are installed at sites of time signal radio transmitters. [113] They are used at some long-wave and medium-wave broadcasting stations to deliver a very precise carrier frequency. [114] Atomic clocks are used in many scientific disciplines, such as for long-baseline interferometry in radio astronomy. [115]

  6. Master clock - Wikipedia

    en.wikipedia.org/wiki/Master_clock

    Master clock (at left) driving several slave clocks in an enthusiast's garage. The third one from the left at the top is a radio-controlled clock for reference. The master atomic clock ensemble at the U.S. Naval Observatory in Washington, D.C., which provides the time standard for the U.S. Department of Defense. [1]

  7. United States Naval Observatory - Wikipedia

    en.wikipedia.org/wiki/United_States_Naval...

    The observatory also operates four [34] rubidium atomic fountain clocks, which have a stability reaching 7 × 10 −16. [35] The observatory plans to build several more of this type for use at its two facilities. [33] The clocks used for the USNO timescale are kept in 19 environmental chambers, whose temperatures are kept constant to within 0.1°C.

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    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  9. 12-hour clock - Wikipedia

    en.wikipedia.org/wiki/12-hour_clock

    Even in those countries where the 12-hour clock is predominant, there are frequently contexts (such as science, medicine, the military or transport) in which the 24-hour clock is preferred. In most countries, however, the 24-hour clock is the standard system used, especially in writing. Some nations in Europe and Latin America use a combination ...