CONSTELLATION (noun) definition and synonyms | Macmillan Dictionary.

Is Constellation a noun?

An arbitrary formation of stars perceived as a figure or pattern. An image associated with a group of stars. Any of the 88 officially recognized regions of the sky, including all stars and celestial bodies in the region.

Is sky an adjective?

​the space above the earth that you can see when you look up, where clouds and the sun, moon and stars appear You usually say the sky. When sky is used with an adjective, use a… sky over/above something The skies above London were ablaze with a spectacular firework display. ...