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abstraction > mathematical concept > unit > time unit > year > sidereal year
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sidereal year
subjectfact 
sidereal yearhas definition A period of time based on the revolution of the Earth around the Sun, where a year is defined as the mean period of revolution with respect to the background stars.has source: Seidelman, P. 1992 Explanatory Supplement to the Astronomical Almanac, University Science Books, Mill Valley, CA, 2001-09-27 09:32:52.0
is an instance of year2001-09-27 09:32:52.0
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