What causes day and night on earth?
When the Earth spins around on its axis, it creates night and day on Earth. This movement makes it look like the Sun is moving across the sky. The Sun rises in the east and sets in the west, turning day into night.
Most places on Earth have some amount of day and night every 24 hours. On Earth, the length of day and night usually changes with the seasons. When your location on Earth is facing toward the sun, it is day. When your location is facing away from the sun, it is night.