Day and night are caused by the Earth’s rotation on its axis. The Earth rotates, or spins, on an imaginary line that runs through the North Pole and South Pole. It takes about 24 hours for the Earth to make one complete rotation.

As the Earth rotates, different parts of the Earth are exposed to the sun’s light. When the side of the Earth that is facing the sun is lit up, it is day. When the side of the Earth that is not facing the sun is in the dark, it is night.

During the day, the sun’s light shines on the Earth and warms the surface. The sun’s light is also what gives us the ability to see things. At night, the side of the Earth that is away from the sun is in the dark, so we cannot see as well.

The Earth’s rotation on its axis is what causes day and night. Understanding this process can help us learn more about the Earth and how it moves in space.