The motion of the Earth that causes the sun to seem to rise and set each day is Earth's rotation on its axis.

Here's why:

* Earth's Rotation: Our planet spins on its axis, completing one full rotation approximately every 24 hours.

* Perspective: As Earth spins, different parts of the planet face the sun. When your location faces the sun, it's daytime. When your location faces away from the sun, it's nighttime.

* Apparent Motion: Because of Earth's rotation, the sun appears to move across the sky from east to west, rising in the east and setting in the west.

It's important to remember that the sun itself isn't actually moving, but rather Earth's rotation creates the illusion of the sun's movement.