https://www.cnn.com/2023/01/25/world/earth-core-turning-scli-scn-intl/index.html
This article claims that geologists have been watching the earth's core
slow it's rotation relative to the rest of the earth for a while, and
that it seems to have stopped. Changing the motion of 1/3 of the mass
of the earth should be detectable.
Ron Okimoto
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