1. (n.) Astrology.

2. (n.) 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.

3. (n.) A treatise on, or text-book of, the science.

astrogeology astrognosy astrography astrolithology astrophotography astrophysics celestial mechanics gravitational astronomy meteoritics radar astronomy radio astronomy solar physics spectrography spectroscopy stargazing stellar photometry uranography uranology uranometry