- Enter a word for the dictionary definition.
From The Collaborative International Dictionary of English v.0.48:
Astronomy \As*tron"o*my\, n. [OE. astronomie, F. astronomie, L. astronomia, fr. Gr. ?, fr. ? astronomer; 'asth`r star + ? to distribute, regulate. See Star, and Nomad.] 1. Astrology. [Obs.] [1913 Webster] Not from the stars do I my judgment pluck; And yet methinks I have astronomy. --Shak. [1913 Webster] 2. The science which treats of the celestial bodies, of their magnitudes, motions, distances, periods of revolution, eclipses, constitution, physical condition, and of the causes of their various phenomena. [1913 Webster] 3. A treatise on, or text-book of, the science. [1913 Webster] Physical astronomy. See under Physical. [1913 Webster]