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  2. NIST-F1 - Wikipedia

    en.wikipedia.org/wiki/NIST-F1

    NIST-F1, source of the official time of the United States. 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 ...

  3. Time synchronization in North America - Wikipedia

    en.wikipedia.org/wiki/Time_synchronization_in...

    The US service is provided by radio stations WWV (Colorado) and WWVH (Hawaii). The methods below provide either Coordinated Universal Time (UTC), which is defined by Recommendation ITU-R TF.460 , [ 3 ] or the official U.S. implementation of UTC, officially labeled UTC (NIST).

  4. Time in the United States - Wikipedia

    en.wikipedia.org/wiki/Time_in_the_United_States

    Standard time zones in the United States and other regions are currently defined at the federal level by statute 15 U.S.C. § 260. The federal law also establishes the transition dates and times at which daylight saving time occurs, with federal law making its observation dependent on state or tribal law.

  5. Doomsday clock 2024 - live: Scientists to reveal how close we ...

    www.aol.com/news/doomsday-clock-2024-live...

    The Doomsday Clock will be updated today as a symbol of the threat from war, nuclear weapons and the climate crisis, as well as more new concerns such as artificial intelligence. It reached that ...

  6. Doomsday clock ticks down, closest ever to "global ... - AOL

    www.aol.com/news/doomsday-clock-ticks-down...

    The Doomsday clock was set at 89 seconds to midnight on Tuesday morning, putting it the closest the world has ever been to what scientists deem "global catastrophe." The decades-old international ...

  7. World clock - Wikipedia

    en.wikipedia.org/wiki/World_clock

    A world clock is a clock which displays the time for various cities around the world. The display can take various forms: The clock face can incorporate multiple round analogue clocks with moving hands or multiple digital clocks with numeric readouts, with each clock being labelled with the name of a major city or time zone in the world. The ...

  8. WWV (radio station) - Wikipedia

    en.wikipedia.org/wiki/WWV_(radio_station)

    WWV Transmitter Building (2002 or earlier) WWV's 15 MHz antenna WWV is a shortwave ("high frequency" or HF) radio station, located near Fort Collins, Colorado.It has broadcast a continuous time signal since 1945, and implements United States government frequency standards, with transmitters operating on 2.5, 5, 10, 15, 20, and 25 MHz. [1]

  9. Geochron - Wikipedia

    en.wikipedia.org/wiki/Geochron

    The Geochron was the first world clock to display day and night on a world map, showing the sinh "bell curve" of light and darkness. The Geochron employs an intricate analog clockwork mechanism for its display, that shows the month, date, day of the week, hours and minutes, the areas of the world currently experiencing day and night , and the ...

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