Reports According to, scientists have estimated that 1.4 billion years ago, it took 18 hours for the Earth to complete one rotation on its axis, which means that day and night used to last for 18 hours. Due to the Moon moving away from the Earth, the rotation speed of the Earth is continuously decreasing. This has come to light in a study by Wisconsin-Madison University. Researchers studied a 90 million year old rock.
The current distance between the Moon and Earth is 3 lakh 84 thousand 400 kilometers. The Moon takes 27.3 days to complete one revolution around the Earth. The study says that the Moon is moving away at a speed of 3.82 centimeters every year. Due to this, after 200 million years, there may be a 25-hour day on Earth.
In another research, scientists have said that the distance between the Earth and the Moon which is 384,400 kilometers today, was 321,800 kilometers two and a half billion years ago and the length of the day was 16.9 hours instead of 24 hours. Researchers say that billions of years ago the Moon was actually closer to our planet and now it is slowly moving away. This research can help scientists understand the Earth-Moon system.
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