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Cosmic Coffee Time with Andrew PrestageEpisode from the podcastCosmic Coffee Time with Andrew Prestage
#81 After centuries of Earth’s rotation slowing down, it’s now speeding up and making the days shorter. But you’d never notice.

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

Released Thursday, 31st July 2025
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#81 After centuries of Earth’s rotation slowing down, it’s now speeding up and making the days shorter. But you’d never notice.

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

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

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

Thursday, 31st July 2025
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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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It's cosmology in a cup! - Cosmic Coffee Time is bite sized podcasts making sense of space, astronomy, life, and the universe, best enjoyed with a coffee. A down to earth look at what's up there, and it's just for you spacefans. Grab a coffee and see where in the universe we go this time. Follow on Twitter @CosmicCoffTime

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