Here's a breakdown:

* Earth's Rotation: Earth spins on its axis, completing one rotation approximately every 24 hours. This rotation is what causes day and night.

* Perspective: As Earth rotates, we on the surface experience the sun's position changing in the sky. Since we're rotating eastward, the sun appears to move westward across the sky.

* Not Actual Motion: It's important to remember that the sun itself is not actually moving from east to west. It's our perspective from Earth that creates this illusion.

Let me know if you have any other questions!