Arrange the flashlight, the mirror and the ball to represent the position of the sun, the moon and Earth in the solar system. Set the flashlight and the ball 4 feet apart. Imagine a line connecting the two. Place the mirror 6 inches from the ball and 6 inches off the line.
Dim the lights and turn on the flashlight -- the sun. Point the flashlight in the direction of the mirror -- the moon -- and the ball, representing Earth.
Adjust the mirror so that it reflects the light from your flashlight onto the ball, the same way the moon reflects the sun’s light upon Earth.
Move the position of the mirror around the ball to demonstrate the moon's rotation around Earth. Keep the light from your mirror reflecting on the ball while doing so, showing how the moon reflects sunlight upon Earth as it orbits the planet.