What causes constellation?

Answer 1

A constellation is caused by two things, the first of which is the arrangement of the stars (or planets) themselves in the sky when viewed from a particular perspective. Perspective is the second cause, that is, the human ability to see the arrangement of stars, then to see similarities with other objects in comparison to that arrangement.

Answer 2

Constellations are patterns of stars in the sky as seen from Earth. They are formed by the apparent arrangement of stars when viewed from our perspective on Earth. The specific arrangement of stars in a constellation is determined by our position in the universe and how the stars are positioned relative to each other.