apex vs apex of the sun's way

apex and apex of the sun's way both are nouns.

Word	Noun	Adjective	Verb	Adverb
apex	Yes	No	No	No
apex of the sun's way	Yes	No	No	No

As nouns, apex and apex of the sun's way are synonyms defined as:

apex and apex of the sun's way: 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 apex include solar apex.

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