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The Earth's rotation is slowing down by about 1.7 milliseconds per century.
This description explains the phenomenon of the Earth's rotation slowing down over time. It states that the Earth's rotation is slowing down by about 1.7 milliseconds per century. This has implications for the length of the day, as the slowing of the Earth's rotation means that days are getting longer
From Wikipedia
Earth's rotation or Earth's spin is the rotation of planet Earth around its own axis, as well as changes in the orientation of the rotation axis in space. Earth rotates eastward, in prograde motion. As viewed from the northern polar star Polaris, Earth turns counterclockwise.