Nasa

The Earth’s Rotation Is Gradually Slowing Down

For billions of years, Earth’s rotation has been gradually slowing down. It’s a process that continues to this day, and estimates suggest that the length of a day currently increases by about 1.8 milliseconds every century. The day's length varies slightly from year to year, as well; the result of myriad forces both on and off Earth pushing and pulling at its rotation.

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