/ Dictionary / Index A astronomical frame of reference: Meaning and Definition of Find definitions for: astronom'ical frame' of ref'erence Pronunciation: [key] — Physics. Physics. a frame of reference in which the sun or center of mass of the universe is fixed and which does not rotate with respect to the fixed stars. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. astronomical clock astronomical refraction Related Content Daily Word Quiz: supine Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language