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Days on Earth are getting longer as the moon steadily drifts away from Earth.
The further the moon drifts, the less gravitational pull it exerts on the planet and the longer days on Earth will become.
The weakening attraction between the Earth and the moon has resulted in the planet's spin slowing, taking it longer to complete a 360° rotation.
A new study reconstructing the history of Earth has found that 1.4 billion years ago the days on Earth lasted just over 18 hours.
Researchers found the shorter days were caused, at least in part, by the moon's closer proximity to Earth.
The closer the moon was to the surface of the planet, the stronger its gravitational pull and the quicker it made Earth spin.
This contributed to the days on Earth lasting six hours less than they do today.
Professor Stephen Meyers, of the University of Wisconsin-Madison and co-author of the study, said: 'As the moon moves away, the Earth is like a spinning figure skater who slows down as they stretch their arms out.'