solar apex vs apex

solar apex and apex both are nouns.

Word	Noun	Adjective	Verb	Adverb
solar apex	Yes	No	No	No
apex	Yes	No	No	No

As nouns, solar apex and apex are synonyms defined as:

solar apex and apex: the point on the celestial sphere toward which the sun and solar system appear to be moving relative to the fixed stars

Other synonyms of solar apex include apex of the sun's way.

solar apex (noun)	apex (noun)
the point on the celestial sphere toward which the sun and solar system appear to be moving relative to the fixed stars	the highest point (of something)
	the point on the celestial sphere toward which the sun and solar system appear to be moving relative to the fixed stars