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ephemeris second
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ephemeris second
noun Astronomy.
the unit of ephemeris time, defined as a precise fraction of the length of the tropical year 1900.
Origin:
1965–70
1965–70
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
Cite This Source
Based on the Random House Dictionary, © Random House, Inc. 2012.
Cite This Source
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Ephemeris second
is always a great word to know.
So is binary star. Does it mean:
| the time when the sun is farthest south from the celestial equator occurring around December 21st |
| a system of two stars that revolve about a common center of mass |
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