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  2. Nocturnal (instrument) - Wikipedia

    en.wikipedia.org/wiki/Nocturnal_(instrument)

    A nocturnal is an instrument used to determine the local time based on the position of a star in the night sky relative to the pole star. As a result of the Earth's rotation, any fixed star makes a full revolution around the pole star in 23 hours and 56 minutes and therefore can be used as an hour hand. The 4-minute difference between the solar ...

  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. 12-hour clock - Wikipedia

    en.wikipedia.org/wiki/12-hour_clock

    The time 8:45 may be spoken as "eight forty-five" or "(a) quarter to nine". [17] In older English, it was common for the number 25 to be expressed as "five-and-twenty". [18] In this way the time 8:35 may be phrased as "five-and-twenty to 9", [19] although this styling fell out of fashion in the later part of the 1900s and is now rarely used. [20]

  5. Traditional Chinese timekeeping - Wikipedia

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

    DiวŽn (็‚น; ้ปž), or point, marked when the bell time signal was rung. The time signal was released by the drum tower or local temples. [citation needed] Each diวŽn or point is 1 ⁄ 60 of a day, making them 0.4 hours, or 24 minutes, long. Every sixth diวŽn falls on the gฤ“ng, with the rest evenly dividing every gฤ“ng into 6 equal parts.

  6. Japanese clock - Wikipedia

    en.wikipedia.org/wiki/Japanese_clock

    Two separate foliot balances allow this 18th-century Japanese clock to run at two different speeds to indicate unequal hours.. A Japanese clock (ๅ’Œๆ™‚่จˆ, wadokei) is a mechanical clock that has been made to tell traditional Japanese time, a system in which daytime and nighttime are always divided into six periods whose lengths consequently change with the season.

  7. Incense clock - Wikipedia

    en.wikipedia.org/wiki/Incense_clock

    The incense clock (simplified Chinese: ้ฆ™้’Ÿ; traditional Chinese: ้ฆ™้˜; pinyin: xiฤngzhลng; Wade–Giles: hsiang-chung; lit. 'fragrance clock') is a timekeeping device that originated from China during the Song Dynasty (960–1279) and spread to neighboring East Asian countries such as Japan and Korea. The clocks' bodies are effectively ...

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