Earth is always moving. While it orbits the Sun once a year, it also spins like a top on its axis. One full spin takes about 24 hours. That rotation is what creates day and night. The side of Earth facing the Sun is lit up with daytime. The side turned away from the Sun is in darkness. As Earth keeps spinning, your location moves into and out of sunlight, and the sky brightens or darkens.
🔄 SPIN
Earth rotates once about every 24 hours on an imaginary line called its axis, from the North Pole to the South Pole.