(Latin: heaven, sky)

celestia (s) (noun) (no plural)
Celestia displays and interacts with objects ranging in scale from small spacecraft to entire galaxies.
celestial (adjective), more celestial, most celestial
1. Relating to the sky or the heavens: Planets are considered to be celestial bodies.
2. A reference to heaven; divine: Angels are celestial beings.
3. Characteristic of be supremely good; sublime: Mark felt celestial happiness when he got married.
celestial atlas (s) (noun), celestial atlases (pl)
A book of charts of the sky: "The early celestial atlases were not intended to be guides for amateur star-gazers, but for the use of working astronomers, as a background on which to determine the changing positions of the moon, planets, and comets."
celestial navigation (s) (noun), celestial navigations (pl)
Movements by means of the observations made of the apparent positions of heavenly bodies.
celestial sphere (s) (noun), celestial spheres (pl)
1. The imaginary orbit around the earth on which the sun, moon, stars, and planets appear to be placed.
2. The imaginary shell formed by the sky; usually, represented as an infinite circle, the center of which is the observer's position.
celestiality (s) (noun), celestialities (pl)
The sky and the planets, suns, and moons that exist there.
celestially (adverb) (not comparable)
A reference to the heavens or the distant sky of the sun, moon, and stars.