apex of the sun's way vs solar apex

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

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

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

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

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