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ephemeris second
subjectfact 
ephemeris secondhas value 1/31556925.97474 tropical yearhas source: Hopkins, J. 1976 Glossary of Astronomy and Astrophysics, University of Chicago Press, 2001-09-27 09:32:54.0
has definition The length of a tropical second (1/31556925.97474 of the tropical year) on 1900 January 0.5 ephemeris time.has source: Hopkins, J. 1976 Glossary of Astronomy and Astrophysics, University of Chicago Press, 2001-09-27 09:32:53.0
is an instance of second unit2001-09-27 09:32:53.0
time unitis a unit of time2001-09-27 09:32:52.0
unithas historical origin2001-09-27 09:32:42.0
represents2001-09-27 09:32:42.0