单词 | ephemeris time |
释义 | Word Frequency ephemeris timenoun 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 It was used from 1960 to 1983as an astronomical timescale but has been replaced by terrestrial dynamical time and barycentric dynamic time |
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