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  2. History of timekeeping devices - Wikipedia

    en.wikipedia.org/wiki/History_of_timekeeping_devices

    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 they crossed the meridian. [24]

  3. Epoch (computing) - Wikipedia

    en.wikipedia.org/wiki/Epoch_(computing)

    Software timekeeping systems vary widely in the resolution of time measurement; some systems may use time units as large as a day, while others may use nanoseconds.For example, for an epoch date of midnight UTC (00:00) on 1 January 1900, and a time unit of a second, the time of the midnight (24:00) between 1 January 1900 and 2 January 1900 is represented by the number 86400, the number of ...

  4. Elapsed real time - Wikipedia

    en.wikipedia.org/wiki/Elapsed_real_time

    In computing, elapsed real time, real time, wall-clock time, wall time, or walltime is the actual time taken from the start of a computer program to the end. In other words, it is the difference between the time at which a task finishes and the time at which the task started.

  5. Mean time between failures - Wikipedia

    en.wikipedia.org/wiki/Mean_time_between_failures

    For each observation, the "down time" is the instantaneous time it went down, which is after (i.e. greater than) the moment it went up, the "up time". The difference ("down time" minus "up time") is the amount of time it was operating between these two events.

  6. Intertestamental period - Wikipedia

    en.wikipedia.org/wiki/Intertestamental_period

    The intertestamental period or deuterocanonical period (Catholic and Eastern Orthodox) is the period of time between the events of the protocanonical books and the New Testament. It is considered to cover roughly 400 years, spanning from the ministry of Malachi (c. 420 BC) to the appearance of John the Baptist in the early 1st century AD .

  7. Time in physics - Wikipedia

    en.wikipedia.org/wiki/Time_in_physics

    the first appearance (see: heliacal rising) of Sirius to mark the flooding of the Nile each year [3] the periodic succession of night and day, seemingly eternally [4] the position on the horizon of the first appearance of the sun at dawn [5] the position of the sun in the sky [6] the marking of the moment of noontime during the day [7]

  8. Time - Wikipedia

    en.wikipedia.org/wiki/Time

    Time is the continuous progression of existence that occurs in an apparently irreversible succession from the past, through the present, and into the future. [1] [2] [3] It is a component quantity of various measurements used to sequence events, to compare the duration of events (or the intervals between them), and to quantify rates of change of quantities in material reality or in the ...

  9. Discrete time and continuous time - Wikipedia

    en.wikipedia.org/wiki/Discrete_time_and...

    A variable measured in discrete time can be plotted as a step function, in which each time period is given a region on the horizontal axis of the same length as every other time period, and the measured variable is plotted as a height that stays constant throughout the region of the time period. In this graphical technique, the graph appears as ...

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