Earth's Rotation
Earth's rotation is the steady spin of our planet that moves the sun across the sky each day.
Think of it this way
A bowl sits on a table with a lamp shining on one side. A grape on the rim sits in the light. Turn the bowl slowly, and the grape moves from light to shadow to light again. Earth spins the same way — one full turn each day brings sunrise, then noon, then night.
Explaining earth's rotation by grade level
The Earth spins like a top. It never stops. That spin moves the sun across the sky. A sundial uses the sun's shadow to show the time. As Earth turns, the shadow shifts to a new spot.