Earth spins (rotates) on its axis -- an imaginary line running from the North Pole to the South Pole -- completing one full rotation every 24 hours. This rotation is what causes day and night, as different parts of Earth face toward or away from the sun. Earth spins from west to east, which is why the sun appears to rise in the east and set in the west. Earth's rotation also affects wind and ocean current patterns.
Use a globe with a sticker marking the student's location. Slowly spin the globe while keeping a flashlight (sun) stationary. Students watch their sticker move from the sunlit side (day) into the shadow (night) and back. Discuss why east gets sunrise first. Use a turntable or spinning chair to feel rotation. Compare 24-hour rotation to the 365-day orbit around the sun -- rotation is the daily spin, orbit is the yearly trip.
You already know that day and night happen because Earth spins. Now let's look at that spin -- called rotation -- more closely.
Earth rotates around an imaginary line called its axis. This axis runs from the North Pole to the South Pole straight through the center of the planet. Think of it like a top spinning on its point -- Earth spins around this axis once every 24 hours, which is one full day. That single spin is what gives us one complete cycle of day and night.
Earth rotates from west to east. You might wonder: if Earth spins west to east, why does the sun appear to move from east to west across the sky? It is an illusion of perspective. As your location on Earth spins eastward, you are rotating toward the sun in the morning -- so the sun seems to appear on the eastern horizon (sunrise). As Earth keeps spinning, you pass the point directly facing the sun (noon, when the sun is highest). Then you begin spinning away from the sun, and it appears to drop toward the western horizon (sunset). The sun is not moving around us -- we are spinning past it, like watching lampposts go by from a car window.
You might wonder: if Earth is spinning so fast, why do we not feel it? At the equator, the surface of Earth is moving at about 1,670 kilometers per hour. But the rotation is perfectly smooth and constant -- it never speeds up, slows down, or changes direction. Your body, the air around you, the ground, and everything on Earth are all moving together at the same speed. You only feel motion when it changes -- when a car accelerates, brakes, or turns. Constant motion feels like no motion at all. That is why you can stand perfectly still and not feel the Earth spinning beneath you, even though it never stops.
There is one more thing to know: rotation and orbit are different. Rotation is Earth spinning on its axis (one spin = one day = 24 hours). Orbit is Earth traveling around the sun (one full trip = one year = 365.25 days). Earth does both at the same time -- spinning like a top while also circling the sun like a ball on a track.