Why do constellations seem to be moving?

Constellations appear to move due to the Earth's rotation on its axis and its orbit around the Sun. As the Earth rotates, different stars and constellations rise in the east and set in the west, creating a nightly change in their positions. Additionally, as the Earth orbits the Sun, the night sky shifts over the course of the year, causing seasonal changes in which constellations are visible. This combination of rotation and revolution gives the impression that the stars and constellations are moving.