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A day on Earth is described as 24 hours, but the planet has been slowing down for billions of years — and growth rings in ancient coral fossils show that 380 million years ago, hundreds of millions of years before any dinosaur existed, an Earth day was only about 22 hours long

Earth’s Day Length: A Slow Dance Through Time In a remarkable revelation that may alter our understanding of Earth's geological history, scientists have confirmed that the length of a day...