Zimmerman posts on The Core. It used to spin faster than our mantle and crust but, now... doesn't?
I'm pondering tides: lunar, solar, Jovian, maybe Venerian. Milankovitch comes to mind. (Not Velikovsky. Sigh.)
As Zimmerman ponders, the very readings we'd taken in the 2000s could be bad. I expect tides would do this to the readings more than to the mantle.
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