/ Thesaurus / S Synonyms of solar apex Find synonyms for: Noun1. apex, solar apex, apex of the sun's way, celestial pointusage: the point on the celestial sphere toward which the sun and solar system appear to be moving relative to the fixed starsWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: effervescent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language