sidereal year

sidereal year

noun Astronomy.
year (def. 4c).

Origin:
1675–85
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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Sidereal year is always a great word to know.
So is constellation. Does it mean:
any of various groups of stars to which definite names have been given and the section of the heavens occupied by such a group, such as Ursa Major, Andromeda
the small circle of the celestial sphere whose plane is tangent to the earth at the position of the observer
Collins
World English Dictionary
sidereal year
 
n
See year

Collins English Dictionary - Complete & Unabridged 10th Edition
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