sidereal

英 [saɪ'dɪərɪəl] 美[saɪ'dɪrɪəl]

• adj. [天] 恒星的；根据星球运行测定的

1. of or relating to the stars or constellations;

"sidereal bodies"

"the sidereal system"

2. (of divisions of time) determined by daily motion of the stars;

"sidereal time"