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  2. List of largest clock faces - Wikipedia

    en.wikipedia.org/wiki/List_of_largest_clock_faces

    A list of permanent working clocks with the largest faces in the world. Entries include all clocks with faces at least 4 m (13 ft) in diameter. Clocks can be located on the exterior or interior of buildings, and towers as well as on the ground as is the case with floral clock faces.

  3. Clock face - Wikipedia

    en.wikipedia.org/wiki/Clock_face

    The face may also include a second hand, which makes one revolution per minute. The term is less commonly used for the time display on digital clocks and watches. A second type of clock face is the 24-hour analog dial, widely used in military and other organizations that use 24-hour time. This is similar to the 12-hour dial above, except it has ...

  4. Accelerometer - Wikipedia

    en.wikipedia.org/wiki/Accelerometer

    An accelerometer measures proper acceleration, which is the acceleration it experiences relative to freefall and is the acceleration felt by people and objects. [2] Put another way, at any point in spacetime the equivalence principle guarantees the existence of a local inertial frame, and an accelerometer measures the acceleration relative to that frame. [4]

  5. New atomic clock claims title of world's most accurate - AOL

    www.aol.com/news/2009-04-16-new-atomic-clock...

    To achieve that impressive feat, the scientists made use of the same so-called "pendulum effect" of atoms as before, but took things one step further by holding the atoms in a laser beam and ...

  6. Casio Wave Ceptor - Wikipedia

    en.wikipedia.org/wiki/Casio_Wave_Ceptor

    The Multi-Band 5 indicates that it can receive time calibration signals from five radio towers in the world. The Wave Ceptor series (stylized as WAVE CEPTOR or WaveCeptor) is a line of radio-controlled watches by Casio. Wave Ceptor watches synchronise with radio time signals broadcast by

  7. Clock position - Wikipedia

    en.wikipedia.org/wiki/Clock_position

    The clock face with its clock positions is a heritage of Roman civilization, as is suggested by the survival of Roman numerals on old clocks and their cultural predecessors, sundials. The mechanical clock supplanted the sundial as the major timekeeper, while the Hindu–Arabic numeral system replaced the Roman as the number system in Europe in ...

  8. List of tallest clock towers - Wikipedia

    en.wikipedia.org/wiki/List_of_tallest_clock_towers

    University has one central tower (no clock face) and four ancillary towers upon which one clock face and a barometer and thermometer are located. The height given is for the ancillary towers. The main building is 239 m (784 ft). Clock faces are 9 m (30 ft) [26] [27] 14: Mortegliano bell tower: 113.2 m (371 ft) 4: Yes: 1959: Tower Building ...

  9. History of timekeeping devices - Wikipedia

    en.wikipedia.org/wiki/History_of_timekeeping_devices

    The most accurate pendulum clocks were controlled electrically. [166] The Shortt–Synchronome clock, an electrical driven pendulum clock designed in 1921, was the first clock to be a more accurate timekeeper than the Earth itself. [167] A succession of innovations and discoveries led to the invention of the modern quartz timer.