apparent horizon vs visible horizon

apparent horizon and visible horizon both are nouns.

Word	Noun	Adjective	Verb	Adverb
apparent horizon	Yes	No	No	No
visible horizon	Yes	No	No	No

As nouns, apparent horizon and visible horizon are synonyms defined as:

apparent horizon and visible horizon: the line at which the sky and Earth appear to meet

Other synonyms of apparent horizon include horizon, sensible horizon, skyline.

apparent horizon (noun)	visible horizon (noun)
the line at which the sky and Earth appear to meet	the line at which the sky and Earth appear to meet