Celestial horizon and True horizon

Celestial horizon noun - The great circle on the celestial sphere whose plane passes through the sensible horizon and the center of the Earth.

True horizon and celestial horizon are semantically related. In some cases you can use "True horizon" instead a noun phrase "Celestial horizon".

Celestial horizon and true horizon are semantically related. You can use "Celestial horizon" instead a noun phrase "True horizon".