Apparent horizon and Celestial horizon

Apparent horizon noun - The line at which the sky and Earth appear to meet.

Celestial horizon and apparent horizon are semantically related. In some cases you can replace phrase "Celestial horizon" with "Apparent horizon", this phrases are similar.

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

Apparent horizon and celestial horizon are semantically related. Sometimes you can replace phrase "Apparent horizon" with "Celestial horizon", this phrases are similar.