Here's why:
* Earth's Rotation: Our planet rotates on its axis from west to east. This rotation causes the apparent movement of celestial objects, including stars, across the sky.
* Perspective: As the Earth turns, it's like we are facing different parts of the sky. Since the Earth rotates eastward, we see the stars moving westward across the sky.
Important Note: The stars themselves don't actually move across the sky in a literal sense. It's just our perspective on Earth that makes it seem this way.