ephemeris time

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Definitions of ephemeris time words

noun ephemeris time time that is based on the orbit of the earth around the sun rather than the axial rotation of the earth, one ephemeris second being 1⁄31 556 925.9747 of the tropical year 1900. It was used from 1960 to 1983 as an astronomical timescale but has been replaced by terrestrial dynamical time and barycentric dynamic time 0
noun ephemeris time (astronomy) A former standard astronomical time scale intended to overcome the drawbacks of irregularly fluctuating mean solar time, superseded in the 1970s. 0
noun ephemeris time (astronomy) A modern relativistic-coordinate time scale. 0

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This term is known only to a narrow circle of people with rare knowledge. Only 7% of English native speakers know the meaning of this word.

According to our data most of word are more popular. This word is almost not used. It has a much more popular synonym.

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