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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. The military time zone system ensures clear ...

  3. United States Naval Observatory - Wikipedia

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

    The United States Naval Observatory ( USNO) is a scientific and military facility that produces geopositioning, navigation and timekeeping data for the United States Navy and the United States Department of Defense. [ 2] Established in 1830 as the Depot of Charts and Instruments, it is one of the oldest scientific agencies in the United States ...

  4. Slave clock - Wikipedia

    en.wikipedia.org/wiki/Slave_clock

    In telecommunication and horology, a slave clock is a clock that depends on another clock, the master clock. Modern clocks are synchronized through the Internet or by radio time signals, to Coordinated Universal Time. UTC is based on a network of atomic clocks in many countries. For scientific purposes, precision clocks can be synchronized to ...

  5. History of timekeeping devices - Wikipedia

    en.wikipedia.org/wiki/History_of_timekeeping_devices

    History of timekeeping devices. A marine sandglass. It is related to the hourglass, nowadays often used symbolically to represent the concept of time. The history of timekeeping devices dates back to when ancient civilizations first observed astronomical bodies as they moved across the sky. Devices and methods for keeping time have gradually ...

  6. 24-hour clock - Wikipedia

    en.wikipedia.org/wiki/24-hour_clock

    The modern 24-hour clock is the convention of timekeeping in which the day runs from midnight to midnight and is divided into 24 hours. This is indicated by the hours (and minutes) passed since midnight, from 00 (:00) to 23 (:59), with 24 (:00) as an option to indicate the end of the day. This system, as opposed to the 12-hour clock, is the ...

  7. Master clock - Wikipedia

    en.wikipedia.org/wiki/Master_clock

    The master clock (bottom center), controlled by a temperature-compensated mercury pendulum, is wired to slave clocks throughout the building. In addition to wall clocks, it also controls time stamps that are used to stamp documents with the time, and a turret clock used in a clock tower. The "program clock" is a timer that can be programmed ...

  8. National Veterans Memorial and Museum - Wikipedia

    en.wikipedia.org/wiki/National_Veterans_Memorial...

    The National Veterans Memorial and Museum ( NVMM) is the United States' national museum for veterans of the U.S. Armed Forces. The museum is located in Columbus, Ohio, along the Scioto River between Franklinton and Downtown Columbus. The museum's main focus is on the personal stories of U.S. veterans, in contrast to other war museums that are ...

  9. National Watch and Clock Museum - Wikipedia

    en.wikipedia.org/wiki/National_Watch_and_Clock...

    The National Watch and Clock Museum was founded in 1977 by the NAWCC and over time has put together a major collection of horological artifacts, mainly clocks and watches, but also related tools, machinery and ephemera, and has become an important institution in its field. Most of the greatest and most important clocks and watches ever made ...

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