noun Date: 1681 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
SIDEREAL YEAR
Meaning of SIDEREAL YEAR in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012