sidereal time - measured by the diurnal motion of starscosmic time - the time covered by the physical formation and development of the universe sidereal day, day - the time for one complete rotation of the earth relative to a particular star, about 4 minutes shorter than a mean solar day sidereal year - the time for the earth to make one complete revolution around the sun, relative to the fixed stars sidereal month - period between successive conjunctions with a star, 27.322 days |