uranology

from The Century Dictionary.

• noun The knowledge of the heavens.

from the GNU version of the Collaborative International Dictionary of English.

• noun A discourse or treatise on the heavens and the heavenly bodies; the study of the heavens; uranography.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun obsolete the study of the heavens and heavenly bodies, also books about the subject.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun the branch of physics that studies celestial bodies and the universe as a whole