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The Universe: The Phases of the Moon

— The phases of the moon have been used to track time since the dawn of mankind.
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Our World: What is a Tide?

In this NASA video segment learn how the Sun, moon, and gravity all play a role in the creation of tides and waves. Color animation demonstrates how the moon...
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Explain-it: How do the tides work?

Adam Hart-Davis uses a biscuit, a pickled onion and an orange to explain how the sun and moon control the tides.
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