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Yes, it rotates once a day and at present the length of a day is 24 hours. Note however that in the Devonian (400 million years ago) the length of a day was 21.6 hours and when the word first formed (4.3 billion years ago)the length of a day was just 5 hours.

This change in the length of a day is caused by the tidal interaction between the Earth and the Moon. The Moon is slowing the speed of the Earth's spin and is in turn being forced away from the Earth. In the future a day on the Earth will therefore be more than 24 hours.

At a rate of 2.4 hours per 400 million years, the day is becoming longer by 1 second in every 46,000 years.

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10y ago

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