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  2. 24-hour analog dial - Wikipedia

    en.wikipedia.org/wiki/24-hour_analog_dial

    The 24th hour on the right side of the dial is typical for the old Italian time system of 24 hours counted from dusk. Clocks and watches with a 24-hour analog dial have an hour hand that makes one complete revolution, 360°, in a day (24 hours per revolution). The more familiar 12-hour analog dial has an hour hand that makes two complete ...

  3. New Earth Time - Wikipedia

    en.wikipedia.org/wiki/New_Earth_Time

    The Greenwich 24-hour analog clock at 14:06:49 UTC. The hour hand is at an angle of 211° 42′ 15″ from vertical, making the time 211° 42′ 15″ in NET. An example New Earth Time analog clock. New Earth Time (or NET) is an alternative naming system for measuring the time of day proposed in 1999. In NET the day is split into 360 NET ...

  4. 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 ...

  5. Clock angle problem - Wikipedia

    en.wikipedia.org/wiki/Clock_angle_problem

    The time is usually based on a 12-hour clock. A method to solve such problems is to consider the rate of change of the angle in degrees per minute. The hour hand of a normal 12-hour analogue clock turns 360° in 12 hours (720 minutes) or 0.5° per minute. The minute hand rotates through 360° in 60 minutes or 6° per minute. [1]

  6. Clock face - Wikipedia

    en.wikipedia.org/wiki/Clock_face

    A clock face is the part of an analog clock (or watch) that displays time through the use of a flat dial with reference marks, and revolving pointers turning on concentric shafts at the center, called hands. In its most basic, globally recognized form, the periphery of the dial is numbered 1 through 12 indicating the hours in a 12-hour cycle ...

  7. Clock - Wikipedia

    en.wikipedia.org/wiki/Clock

    Casio F-91W digital watch, a historically popular watch. A clock or chronometer is a device that measures and displays time. The clock is one of the oldest human inventions, meeting the need to measure intervals of time shorter than the natural units such as the day, the lunar month, and the year. Devices operating on several physical processes ...

  8. Clock signal - Wikipedia

    en.wikipedia.org/wiki/Clock_signal

    Clock signal. In electronics and especially synchronous digital circuits, a clock signal (historically also known as logic beat) [1] is an electronic logic signal (voltage or current) which oscillates between a high and a low state at a constant frequency and is used like a metronome to synchronize actions of digital circuits.

  9. Radio clock - Wikipedia

    en.wikipedia.org/wiki/Radio_clock

    Radio clock. Not to be confused with clock radio, an alarm clock incorporating a broadcast radio receiver. A radio clock or radio-controlled clock (RCC), and often colloquially (and incorrectly [ 1 ]) referred to as an " atomic clock ", is a type of quartz clock or watch that is automatically synchronized to a time code transmitted by a radio ...

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