You're very close! The Earth's rotation on its axis is the primary cause of day and night. Here's how it works:

* Rotation: The Earth spins on its axis, completing one full rotation roughly every 24 hours.

* Sunlight: The Sun is our primary source of light. As the Earth rotates, different parts of the planet face the Sun.

* Day: The side of the Earth facing the Sun experiences daylight.

* Night: The side of the Earth facing away from the Sun experiences darkness.

It's not just about spinning, it's about the angle:

The Earth's axis is tilted at approximately 23.5 degrees. This tilt is why we have different lengths of days and nights throughout the year, and why we experience seasons.

So, while the Earth's rotation is the key factor, the tilt of its axis plays a vital role in the specific patterns of day and night we experience.