Ephemeris Second
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Ephemeris Second
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This was the fundamental unit of time of the International System of Units
of 1960: 1/31556925.9747 of the tropical year defined by the mean motion of
the sun in longitude at the epoch 1900 January 0 day 12 hours. See ephemeris
time.
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See second
for the definition of the latest unit of time in the SI system or look on the
WWW version of the National Institute of
Standards and Technology: Physics Laboratory's International System of Units
(SI). [[/a>|/a>]]
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References
This article is based on NASA's Dictionary of Technical Terms for Aerospace Use
