Time

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Time

Barycentric dynamical time (TDB): dynamical time for barycentric phenomena which replaced Ephemeris Time when the IAU 1976 System of Astronomical Constants was implemented in the Astronomical Almanac in 1984.The difference between TDT and TDB is due to variations in the gravitational potential around earths orbit, and is always less than 2 milliseconds. It is used as a time scale of ephemerides referred to the barycenter of the solar system.ephemeris time (ET): a uniform time measure now kept.
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Provides descriptions of several standards of time.
Date added: Monday, April 4, 2016
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