* Earth's Rotation: The Earth rotates on its axis, completing a full rotation approximately every 24 hours. This rotation is what causes day and night.
* Perspective: As the Earth rotates, different parts of the planet face the sun. When your location on Earth rotates away from the sun, the sun appears to sink below the horizon, which is what we call sunset.
* Sunlight Scattering: The sun's rays are scattered by the atmosphere. As the sun dips below the horizon, the light has to travel through more of the atmosphere. This causes the light to scatter more, resulting in the beautiful red and orange hues we often see at sunset.
So, in essence, nothing really happens to the sun itself when it sets. It's just a change in our perspective due to Earth's rotation.
