How Did the Moon Affect Earth's Rotation?

The Moon made Earth spin slower over time, just like when you slow down a merry-go-round by holding on to it.

Imagine Earth is like a spinning top, and the Moon is like your hand gently pulling on its edge as it spins. Every day, Earth turns around once, that’s why we have day and night. But when the Moon was much closer to Earth long ago, it pulled harder, making Earth spin faster than it does now.

Earth's rotation used to be quicker, meaning days were shorter, maybe only 6 hours long! But as the Moon moved farther away (like a toy car moving away from you on a string), its pull got weaker. So Earth’s spin slowed down over billions of years, making our days longer.

Think of Earth and the Moon dancing around each other. When they were close, they twirled quickly. But as the Moon drifted out, their dance became slower and more relaxed, just like how you might slow your spin on a merry-go-round if you hold on tighter.