Should We Be Worried The Speed Of Earth's Rotation Is Changing?
BBC Focus - Science & Technology|May 2021
We define a day as 86,400 seconds, or 24 hours – the time it takes for Earth to rotate once.

However, the Earth doesn’t rotate perfectly uniformly. Usually, the Earth’s rotation is actually slowing down so that the length of the day increases by about 1.8 milliseconds per century, on average. This means that 600 million years ago a day lasted only 21 hours.

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