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  2. Equation of time - Wikipedia

    en.wikipedia.org/wiki/Equation_of_time

    Mean solar time, for the same place, would be the time indicated by a steady clock set so that over the year its differences from apparent solar time would have a mean of zero. [1] The equation of time is the east or west component of the analemma , a curve representing the angular offset of the Sun from its mean position on the celestial ...

  3. Longitude by chronometer - Wikipedia

    en.wikipedia.org/wiki/Longitude_by_chronometer

    Time sight is a general method for determining longitude by celestial observations using a chronometer; these observations are reduced by solving the navigational triangle for meridian angle and require known values for altitude, latitude, and declination; the meridian angle is converted to local hour angle and compared with Greenwich hour angle.

  4. Cycles per instruction - Wikipedia

    en.wikipedia.org/wiki/Cycles_per_instruction

    Cycles per instruction. In computer architecture, cycles per instruction (aka clock cycles per instruction, clocks per instruction, or CPI) is one aspect of a processor 's performance: the average number of clock cycles per instruction for a program or program fragment. [1] It is the multiplicative inverse of instructions per cycle .

  5. Equation clock - Wikipedia

    en.wikipedia.org/wiki/Equation_clock

    An equation clock is a mechanical clock which includes a mechanism that simulates the equation of time, so that the user can read or calculate solar time, as would be shown by a sundial. The first accurate clocks, controlled by pendulums, were patented by Christiaan Huyghens in 1657. For the next few decades, people were still accustomed to ...

  6. Proper time - Wikipedia

    en.wikipedia.org/wiki/Proper_time

    Proper time. In relativity, proper time (from Latin, meaning own time) along a timelike world line is defined as the time as measured by a clock following that line. The proper time interval between two events on a world line is the change in proper time, which is independent of coordinates, and is a Lorentz scalar. [1]

  7. Time in physics - Wikipedia

    en.wikipedia.org/wiki/Time_in_physics

    In physics, time is defined by its measurement: time is what a clock reads. [1] In classical, non-relativistic physics, it is a scalar quantity (often denoted by the symbol ) and, like length, mass, and charge, is usually described as a fundamental quantity.

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