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 ab - Space Daily

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 ab Space Daily Something ‘unprecedented’ is now happening to Earth’s rotation, scientists say BBC Science Focus Magazine A Day on Earth Is Getting Longer as the Planet’s Rotation Slows WSJ The Earth spins ever more slowly: what science says a