tidal friction

Tidal friction is the gradual slowing of the Earth's rotation due to the gravitational pull of the Moon and the Sun on the Earth's oceans. As the Earth spins, the gravitational forces create tides, causing ocean water to bulge. This movement creates friction against the Earth's rotation, gradually transferring some energy from the Earth to the Moon, causing it to slowly drift further away. Over millions of years, this effect results in slightly longer days on Earth and affects the positioning of the Moon in our sky.