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  2. 24-hour clock - Wikipedia

    en.wikipedia.org/wiki/24-hour_clock

    24-hour digital clock in Miaoli HSR station. A public 24-hour clock in Curitiba, Brazil, with the hour hand on the outside and the minute hand on the inside.. A time of day is written in the 24-hour notation in the form hh:mm (for example 01:23) or hh:mm:ss (for example, 01:23:45), where hh (00 to 23) is the number of full hours that have passed since midnight, mm (00 to 59) is the number of ...

  3. 12-hour clock - Wikipedia

    en.wikipedia.org/wiki/12-hour_clock

    The number 12 is paired either with a 00 or a 24, while the numbers 1 through 11 are paired with the numbers 13 through 23, respectively. This modification allows the clock to also be read in 24-hour notation. This kind of 12-hour clock can be found in countries where the 24-hour clock is preferred.

  4. List of largest clock faces - Wikipedia

    en.wikipedia.org/wiki/List_of_largest_clock_faces

    Largest church clock face. The minute hand is 5.73 metres (18.8 ft) and the hour hand is 5.07 metres (16.6 ft) 22: Oslo City Hall: 8.6 m (28 ft) [citation needed] 1: Yes: 1950: Building: Norway: Oslo: Tower with clock on it is known as Oslo Rådhus 2 and is 63 m (207 ft). Building hosts the Nobel Peace Prize each year [15] 23: Christchurch ...

  5. Phase response curve - Wikipedia

    en.wikipedia.org/wiki/Phase_response_curve

    The time shown on the x axis is vague: dawn – mid-day – dusk – night – dawn. These times do not refer to actual sun-up etc. nor to specific clock times. Each individual has their own circadian "clock" and chronotype, and dawn in the illustration refers to an individual's time of spontaneous awakening when well-rested and sleeping regul

  6. Time synchronization in North America - Wikipedia

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

    COAA's Radio Clock [21] F6CTE's CLOCK [15] WWVH: 5, 10, and 15 MHz AM Voice with modified IRIG-Hformat time code on 100 Hz sub-carrier (CCIR code) HF radio and antenna (plus software if automatic updating of computer time is desired) TrueTime TL-3 WWV Receiver; CHU: 3.33 MHz, 7.85 MHz, 14.67 MHz Bell 103 modem tones, decodable by most computer ...

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  8. History of timekeeping devices - Wikipedia

    en.wikipedia.org/wiki/History_of_timekeeping_devices

    The first clock known to strike regularly on the hour, a clock with a verge and foliot mechanism, is recorded in Milan in 1336. [96] By 1341, clocks driven by weights were familiar enough to be able to be adapted for grain mills , [ 97 ] and by 1344 the clock in London's Old St Paul's Cathedral had been replaced by one with an escapement. [ 98 ]

  9. List of clock manufacturers - Wikipedia

    en.wikipedia.org/wiki/List_of_clock_manufacturers

    Sir John Bennett; 65 Cheapside, London, watch, clock and jewellery manufacturer (15 October 1814- 3 July 1897), was a watchmaker and local politician. He was the eldest son of John Bennett, watchmaker, of Greenwich.