#81 After centuries of Earth’s rotation slowing down, it’s now speeding up and making the days shorter. But you’d never notice.

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Earth’s days had been getting longer since observations began. Every century, the length of the day would increase by about two milliseconds. Like… clockwork. In recent years, something strange has been happening, the days have started getting shorter as the rotation of the Earth has been speeding up. Even more strangely, we don’t really understand why.

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