What Makes Day and Night

What Makes Day and Night

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We all live on the earth.

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The earth is our planet. It is round like a big ball. And it is spinning.

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It's hard to believe the earth is always turning, because we don't feel any motion. This is because the earth spins smoothly-always at the same speed.

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This is a photograph of the earth. It was taken by a camera aboard the Apollo 17 spacecraft. You can see that the earth is round.

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If you were way out in space and watching the earth, you would see it spin. The earth spins around once in twenty-four hours. Light from the sun falls on one-half of the spinning earth. The half in the light has day. The other half is dark, It is in the earth's shadow. That half has night. As the earth spins we move through the light, into the darkness, and back again. We have day and night.

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