As-trŏn'o-my, n.

n. [Fr. astronomie, Pr. & Lat. astronomia, Gr. ἀστρονομία. See ASTRONOMER.] 1. Formerly, the same as astrology. Not from the stars do I my judgments pluck; And yet methinks I have astronomy. Shak. 2. The science which treats of the celestial bodies, their magnitudes, motions, distances, periods of revolution, eclipses, order, and of the causes of their various phenomena. Physical astronomy. See PHYSICAL.