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  2. Traditional Chinese timekeeping - Wikipedia

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

    Using the definition of kè as 1⁄100 of a day, each kè is equal to 0.24 hours, 14.4 minutes, or 14 minutes 24 seconds. Every shí contains 8 1⁄3 kè, with 7 or 8 full kè and partial beginning or ending kè. These fractional kè are multiples of 1⁄6 kè, or 2 minutes 24 seconds. [ a] The 7 or 8 full kè within each shí were referred to ...

  3. History of timekeeping devices - Wikipedia

    en.wikipedia.org/wiki/History_of_timekeeping_devices

    Huygens first used a clock to calculate the equation of time (the difference between the apparent solar time and the time given by a clock), publishing his results in 1665. The relationship enabled astronomers to use the stars to measure sidereal time , which provided an accurate method for setting clocks.

  4. Canonical hours - Wikipedia

    en.wikipedia.org/wiki/Canonical_hours

    Canonical hours. In the practice of Christianity, canonical hours mark the divisions of the day in terms of fixed times of prayer at regular intervals. A book of hours, chiefly a breviary, normally contains a version of, or selection from, such prayers. [ 1][ 2] In the Roman Rite of the Catholic Church, canonical hours are also called officium ...

  5. Gravitational time dilation - Wikipedia

    en.wikipedia.org/wiki/Gravitational_time_dilation

    e. Gravitational time dilation is a form of time dilation, an actual difference of elapsed time between two events, as measured by observers situated at varying distances from a gravitating mass. The lower the gravitational potential (the closer the clock is to the source of gravitation), the slower time passes, speeding up as the gravitational ...

  6. Timesheet - Wikipedia

    en.wikipedia.org/wiki/Timesheet

    Timesheet. A timesheet (or time sheet) is a method for recording the amount of a worker's time spent on each job. Traditionally a sheet of paper with the data arranged in tabular format, a timesheet is now often a digital document or spreadsheet. The time cards stamped by time clocks can serve as a timesheet or provide the data to fill one.

  7. Time clock - Wikipedia

    en.wikipedia.org/wiki/Time_clock

    Time clock. A time clock, sometimes known as a clock card machine, punch clock, or time recorder, is a device that records start and end times for hourly employees (or those on flexi-time) at a place of business. In mechanical time clocks, this was accomplished by inserting a heavy paper card, called a time card, into a slot on the time clock.

  8. 12-hour clock - Wikipedia

    en.wikipedia.org/wiki/12-hour_clock

    The 12-hour clock can be traced back as far as Mesopotamia and ancient Egypt. [7] Both an Egyptian sundial for daytime use [8] and an Egyptian water clock for night-time use were found in the tomb of Pharaoh Amenhotep I. [9] Dating to c. 1500 BC, these clocks divided their respective times of use into 12 hours each.

  9. Equation of time - Wikipedia

    en.wikipedia.org/wiki/Equation_of_time

    The program can calculate solar declination, Equation of Time, or Analemma; Doing calculations using Ptolemy's geocentric planetary models with a discussion of his E.T. graph; Equation of Time Longcase Clock by John Topping C.1720; The equation of time correction-table A page describing how to correct a clock to a sundial; Solar tempometer ...

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