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Time scales

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  • 1.

    Sidereal time

    Timekeeping system
    Sidereal time
    Overview: Sidereal time is a timekeeping system that astronomers use to locate celestial objects. Using sidereal time, it is possible to easily point a telescope to the proper coordinates in the night sky. Briefly ...
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  • 2.

    Universal Time

    Time standard based on the slowing rotation of the Earth
    Overview: Universal Time (UT) is a time standard based on Earth's rotation. There are several versions of Universal Time, which differ by up to a few seconds. The most commonly used are Coordinated Universal Time ...
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  • 3.

    Standard time

    Synchronization of clocks within a geographical region
    Standard time
    Overview: Standard time is the synchronization of clocks within a geographical area or region to a single time standard, rather than using solar time or a locally chosen meridian (longitude) to establish a local ...
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  • 4.

    Coordinated Universal Time

    Primary time standard
    Coordinated Universal Time
    Overview: Coordinated Universal Time (UTC) is the primary time standard globally used to regulate clocks and time. It establishes a reference for the current time, forming the basis for civil time and time zones ...
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  • 5.

    Time standard

    Specification for measuring time
    Overview: A time standard is a specification for measuring time: either the rate at which time passes; or points in time; or both. In modern times, several time specifications have been officially recognized as ...
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