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  2. International Earth Rotation and Reference Systems Service

    en.wikipedia.org/wiki/International_Earth...

    The Sub-bureau for Rapid Service and Predictions of Earth Orientation Parameters of the IERS, located at the United States Naval Observatory, monitors the Earth's rotation. Part of its mission involves the determination of a time scale based on the current rate of the rotation of the Earth. Other services of IERS are at the Paris Observatory.

  3. 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 ...

  4. World Clock (Alexanderplatz) - Wikipedia

    en.wikipedia.org/wiki/World_Clock_(Alexanderplatz)

    A night view of the World Clock, taken on 22 April 2016. The World Clock (German: Weltzeituhr; German pronunciation: [ˈvɛltt͡saɪ̯tˌʔuːɐ̯] ⓘ), also known as the Urania World Clock (German: Urania-Weltzeituhr), is a large turret-style world clock located in the public square of Alexanderplatz in Mitte, Berlin.

  5. A faster spinning Earth may cause timekeepers to subtract a ...

    www.aol.com/news/faster-spinning-earth-may-cause...

    For the first time in history, world timekeepers may have to consider subtracting a second from our clocks in a few years because the planet is rotating a tad faster than it used to. Clocks may ...

  6. Universal Time - Wikipedia

    en.wikipedia.org/wiki/Universal_Time

    Universal Time (UT or UT1) is a time standard based on Earth's rotation. [1] While originally it was mean solar time at 0° longitude, precise measurements of the Sun are difficult.

  7. Italian six-hour clock - Wikipedia

    en.wikipedia.org/wiki/Italian_six-hour_clock

    Six-hour clock at the Quirinal Palace, Rome The six-hour clock ( Italian : sistema orario a sei ore ), also called the Roman ( alla romana ) or the Italian ( all'italiana ) system, is a system of date and time notation in Italy which was invented before the modern 24-hour clock .

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  9. St Mark's Clock - Wikipedia

    en.wikipedia.org/wiki/St_Mark's_Clock

    St Mark's Clock is housed in the Clock Tower on the Piazza San Marco (Saint Mark's Square) in Venice, Italy, adjoining the Procuratie Vecchie. The first clock housed in the tower was built and installed by Gian Paolo and Gian Carlo Rainieri, father and son, between 1496 and 1499, and was one of a number of large public astronomical clocks ...