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Astronomy

The Influence of the Moon on Earth's Tides and Rotation

Quick fact

The Moon is drifting away from Earth at about 3.8 centimeters per year, and it has slowed Earth's rotation so much that a day was only about 22 hours long during the age of the dinosaurs.

Why this is interesting

Each time you visit the beach, the Moon is quietly tugging on the ocean and even slowing down your planet's spin. In fact, the day you spend 24 hours long is slightly longer than it was a century ago—and the Moon is to blame.