Days were only 17 hours long, due to different dynamics between our planet and its satellite.
Research recently revealed that the Earth and Moon had a much closer relationship about 2.5 billion years ago: The Moon orbited nearer our planet, and Earth’s spin was much faster.
Of course, researchers couldn’t say for sure the distance between even the modern-day Earth and the Moon until we first reached the satellite half a century ago. At that time,that could be seen from Earth. By monitoring their distance over time, scientists determined that the Moon is moving away from us at a rate of about 3.8 centimeters per year on average — due to a gradual decrease in tidal energy that decelerates the Earth’s spin on its axis.
Other methods included the examination of tidal deposits over time to determine the number of days in a lunar month. These kinds of clues can help us estimate how close the Moon was to the Earth on average, andShe and her colleagues wanted to improve reliability — and stretch the evidence back even further. In their latest, they turned to ancient rocks in northwestern Australia. Rocks in the Joffre Member of the Brockman Iron Formation there date back to roughly 2.
Each causes changes in the distribution of sunlight hitting the Earth — and these traces can be seen on ancient rocks, similar to the way that tree rings reveal the cyclical nature of the seasons in a year.Cyclical patterns in the rock layers at the Brockman Iron Formation revealed that about 2.46 billion years ago, the climatic precession cycle was a whole lot shorter than the 21,000 years it takes today.
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