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  2. 12-hour clock - Wikipedia

    en.wikipedia.org/wiki/12-hour_clock

    In speaking, it is common to round the time to the nearest five minutes and/or express the time as the past (or to) the closest hour; for example, "five past five" (5:05). Minutes past the hour means those minutes are added to the hour; "ten past five" means 5:10.

  3. 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 ...

  4. Doomsday Clock - Wikipedia

    en.wikipedia.org/wiki/Doomsday_Clock

    It has since been set backward 8 times and forward 17 times. The farthest time from midnight was 17 minutes in 1991, and the nearest is 90 seconds, set in January 2023. The Clock was moved to 150 seconds (2 minutes, 30 seconds) in 2017, then forward to 2 minutes to midnight in January 2018, and left unchanged in 2019. [5]

  5. Roman timekeeping - Wikipedia

    en.wikipedia.org/wiki/Roman_timekeeping

    The daytime canonical hours of the Catholic Church take their names from the Roman clock: the prime, terce, sext and none occur during the first (prīma) = 6 am, third (tertia) = 9 am, sixth (sexta) = 12 pm, and ninth (nōna) = 3 pm, hours of the day. The English term noon is also derived from the ninth hour. This was a period of prayer ...

  6. 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 ...

  7. Date and time representation by country - Wikipedia

    en.wikipedia.org/wiki/Date_and_time...

    ISO 8601. International standard ISO 8601 (Representation of dates and times) defines unambiguous written all-numeric big-endian formats for dates, such as 2022-12-31 for 31 December 2022, and time, such as 23:59:58 for 23 hours, 59 minutes, and 58 seconds. These standard notations have been adopted by many countries as a national standard, e.g ...

  8. Mengenlehreuhr - Wikipedia

    en.wikipedia.org/wiki/Mengenlehreuhr

    The clock at its original location in May 1979, displaying 17:54 (5:54pm). The Mengenlehreuhr (German for " Set Theory Clock") or Berlin-Uhr (" Berlin Clock") is the first public clock in the world that tells the time by means of illuminated, coloured fields, for which it entered the Guinness Book of Records upon its installation on 17 June 1975.

  9. Traditional Chinese timekeeping - Wikipedia

    en.wikipedia.org/wiki/Traditional_Chinese...

    The time between each gēng is 1⁄10 of a day, making a gēng 2.4 hours—or 2 hours 24 minutes—long. The 5 gēngs in the night are numbered from one to five: yì gēng (一 更) (alternately chū gēng (初更) for "initial watch"); èr gēng (二更); sān gēng (三更); sì gēng (四更); and wǔ gēng (五更). The 5 gēngs in daytime ...

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