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The length of the day on Earth is governed by the rate of spin upon its axis. This is our definition of a day - currently about 24 hours.

In ancient times, the day-length was much shorter; then the Moon collision occurred, and the days from that point became slightly longer.

The moon collision was possibly the slow collision of another Mars-sized body with the Earth, the debris from which created the Moon. This was quite soon after the creation of a separate Earth, about 4.5 billion years ago.

This created gravitational tides on both bodies, Moon and Earth.

On the Earth, the energy of these tides are presented as energy released by tidal friction - a minuscule warming of the oceans.

On the Moon, the energy of these tides (for both must be equal) is seen as a gradual increase in the distance between Earth and Moon. And of course, this gravitational attraction also causes the more massive part of the Moon to present only one face constantly to the Earth.

So:- in the long run, the oceanic tides will lessen (minutely); the day-length will increase slightly; and the Moon will drift further away from the Earth.

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