Celestial object and Celestial sphere

Celestial sphere and celestial object are semantically related in natural object in the sky topic. In some cases you can use "Celestial sphere" instead a noun phrase "Celestial object".

Celestial sphere noun - The apparent surface of the imaginary sphere on which celestial bodies appear to be projected.

Celestial object and celestial sphere are semantically related in permanent natural object in the sky topic. You can use "Celestial object" instead a noun phrase "Celestial sphere".