\begin{definition}[Definition:Celestial]
In the context of astronomy, the word '''celestial''' is an adjective whose meaning is loosely '''of the sky'''.
It is used to define bodies and phenomena vaguely defined as being outside Earth's atmosphere, hence does not apply to meteorological phenomena.
It is often used as an antithesis for the word '''terrestrial''', which means '''of Earth'''.
\end{definition}