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How much heat energy is generated by the Sun and Moon's gravitational action on the Earth?

It would seem fairly obvious that any spinning body orbiting a massive object will convert its own motion into internal heat energy by virtue of the dragging effect of that body's gravity upon it.

This would seem all the more certain in the case in which a body is partially fluid (like the Earth).

What's the wattage of heat generation within the Earth caused by the gravitational drag of the Sun and Moon?

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