sidereal year
noun
plural sidereal years
: the time in which the earth completes one revolution in its orbit around the sun measured with respect to the fixed stars : 365 days, 6 hours, 9 minutes, and 9.5 seconds of mean time
The light-year is defined as the distance light travels in 1 sidereal year …—William D. Johnstone
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Merriam-Webster unabridged
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