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Sidereal Year - Time of true revolution around the sun; that is, the time it takes the Earth (as seen from the sun) to reappear at the same fixed star, equal to 365.2564 mean solar days or 365 days, 6 hours, 9 minutes, 10 seconds.
SIDEREAL TIME The measure of time as defined by the diurnal motion of the vernal equinox. A sidereal day is equivalent to one complete rotation of the earth relative to the equinox, which is 23 hours, 56 minutes, and 4.091 seconds.
year - 1. The period during which the earth completes one revolution around the sun. This has several interpretations, as follows. 1) Sidereal year: time of true revolution around the sun, that is, ...
A sidereal year, which is the time it takes for the earth to make one absolute revolution around the sun, is 365 days, 6 hours, 9 minutes and 9.5 seconds.
It represents the time needed for one complete revolution of the earth about its own axis. Also know as a sidereal day, it is approximately equal to 23 hours, 56 minutes, and 4.09 seconds. Related term: night ...
 See also: Earth, Period, Storm, Snow, Night
  
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