from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun The time required for one complete revolution of the earth about the sun, relative to the fixed stars, or 365 days, 6 hours, 9 minutes, 9.54 seconds in units of mean solar time.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun The
orbital periodof the Earth; a measure of the timeit takes for the Sunto return to the same positionwith respect to the starsof the celestial sphere. A sidereal year is about 20.4 minutes longer than the tropical yeardue to precessionof the equinoxes.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun the time for the earth to make one complete revolution around the sun, relative to the fixed stars
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