Constellations don't actually change their position in the sky during the night. The apparent change we see is due to Earth's rotation.

Here's how it works:

* Earth's Rotation: Our planet spins on its axis, completing one rotation every 24 hours. This rotation causes the sky to appear to move from east to west.

* Perspective: As Earth rotates, the constellations we see in the east slowly rise higher in the sky while those in the west appear to sink lower and disappear below the horizon.

Think of it like this: Imagine you're on a carousel, and you're looking at the stationary trees outside the ride. As the carousel spins, the trees seem to move around you, even though they're actually still.

The constellations are like the trees; they're stationary in space, but our perspective from Earth's spinning surface makes them appear to move.