solar apex vs celestial sphere

solar apex and celestial sphere both are nouns.

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

solar apex (noun)	celestial sphere (noun)
the point on the celestial sphere toward which the sun and solar system appear to be moving relative to the fixed stars	the apparent surface of the imaginary sphere on which celestial bodies appear to be projected