Astronomy

n.	1.	Astrology. Not from the stars do I my judgment pluck; And yet methinks I have astronomy. - Shak.
	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.
	3.	A treatise on, or text-book of, the science. Physical astronomy See under Physical.

Noun

1.

astronomy - the branch of physics that studies celestial bodies and the universe as a whole Synonyms: uranology

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