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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 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 full minutes that have passed since the last full hour, and ss (00 to 59) is the number of seconds since the last ...

  3. Coordinated Universal Time - Wikipedia

    en.wikipedia.org/wiki/Coordinated_Universal_Time

    Each day contains 24 hours and each hour contains 60 minutes. The number of seconds in a minute is usually 60, but with an occasional leap second, it may be 61 or 59 instead. [10] Thus, in the UTC time scale, the second and all smaller time units (millisecond, microsecond, etc.) are of constant duration, but the minute and all larger time units ...

  4. 12-hour clock - Wikipedia

    en.wikipedia.org/wiki/12-hour_clock

    The 12-hour clock is a time convention in which the 24 hours of the day are divided into ... Dating to c. 1500 BC, ... End of day; Written 24-hour time: 00:00: 12:00 ...

  5. List of time periods - Wikipedia

    en.wikipedia.org/wiki/List_of_time_periods

    General periods. Geologic Time – Period prior to humans. 4.6 billion to 3 million years ago. (See "prehistoric periods" for more detail into this.) Primatomorphid Era – Period prior to the existence of Primatomorpha. Simian Era – Period prior to the existence of Simiiformes. Hominoid Era – Period prior to the existence of Hominoidea.

  6. Date and time representation by country - Wikipedia

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

    In Czech quarters and halves always refer to the following hour, e.g. čtvrt na osm (quarter on eight) meaning 7:15, půl osmé (half of eight) meaning 7:30 and tři čtvrtě na osm (three-quarters on eight) meaning 7:45. This corresponds to the time between 7:00 and 8:00 being the eighth hour of the day (the first hour starting at midnight).

  7. History of timekeeping devices - Wikipedia

    en.wikipedia.org/wiki/History_of_timekeeping_devices

    European treatises on sundial design appeared c. 1500. [23] An Egyptian method of determining the time during the night, used from at least 600 BC, was a type of plumb-line called a merkhet. A north–south meridian was created using two merkhets aligned with Polaris, the north pole star. The time was determined by observing particular stars as ...

  8. How to Live on 24 Hours a Day - Wikipedia

    en.wikipedia.org/wiki/How_to_Live_on_24_Hours_a_Day

    How to Live on Twenty-four Hours a Day is a short self-help book "about the daily organization of time" [1] by novelist Arnold Bennett. Written originally as a series of articles in the London Evening News in 1907, it was published in book form in 1908. Aimed initially at "the legions of clerks and typists and other meanly paid workers caught ...

  9. Hour - Wikipedia

    en.wikipedia.org/wiki/Hour

    Hour. Midnight (or noon) to 1 on a 12-hour clock with an analogue face. Midnight to 1 a.m. on a 24-hour clock with a digital face. An hour ( symbol: h; [1] also abbreviated hr) is a unit of time historically reckoned as 1⁄24 of a day and defined contemporarily as exactly 3,600 seconds ( SI ).