A typical desk globe is designed to be a geometric sphere and to rotate smoothly when you spin it. Our actual planet is far less perfect—in both shape and in rotation.
From Jet Propulsion Laboratory/NASA
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Scientists ID Three Causes of Earth's Spin Axis Drift
By Jet Propulsion Laboratory/NASA
September 21, 2018
![[article image]](https://cacm.acm.org/system/assets/0003/2622/92118.jpl.nasa.polar_motion.large.jpg?1537551693&1537551693 "Polar motion")
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