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  2. Astronomical clock - Wikipedia

    en.wikipedia.org/wiki/Astronomical_clock

    The Chartres astronomical clock [ fr] in Chartres Cathedral is an astrolabe clock, installed in 1528. It was overhauled, its mechanism replaced by an electric mechanism, in 2009. Haguenau. The facade of the Musée alsacien displays an astronomical clock, a modern copy of the clock of the Ulm Rathaus.

  3. 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 ...

  4. Repeater (horology) - Wikipedia

    en.wikipedia.org/wiki/Repeater_(horology)

    Repeater (horology) The 13 in (33 cm) watch by Louis Brandt (1892) was the first wristwatch with a minute repeater. The movement was manufactured by Audemars Piguet. A repeater is a complication in a mechanical watch or clock that chimes the hours and often minutes at the press of a button. There are many types of repeater, from the simple ...

  5. Binary clock - Wikipedia

    en.wikipedia.org/wiki/Binary_clock

    A binary clock is a clock that displays the time of day in a binary format. Originally, such clocks showed each decimal digit of sexagesimal time as a binary value, but presently binary clocks also exist which display hours, minutes, and seconds as binary numbers. Most binary clocks are digital, although analog varieties exist.

  6. National Debt Clock - Wikipedia

    en.wikipedia.org/wiki/National_Debt_Clock

    National Debt Clock. Coordinates: 40.7555°N 73.9848°W. The clock at its former location near Sixth Avenue and 44th Street in February 2017, at which time it read $19.9 trillion in national debt. The National Debt Clock is a billboard-sized running total display that shows the United States gross national debt and each American family's share ...

  7. Atomic clock - Wikipedia

    en.wikipedia.org/wiki/Atomic_clock

    An atomic clock is based on a system of atoms which may be in one of two possible energy states. A group of atoms in one state is prepared, then subjected to microwave radiation. If the radiation is of the correct frequency, a number of atoms will transition to the other energy state.

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