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On Mon, 21 Dec 1998, Herb Schulz wrote:
By changing the moment of inertia of the upper and lower parts of the
body appropriately you can have DIFFERENT and opposite angular
velocities so the different parts of the body will rotate through
different angles in the same amount of time.
"That's how we aim camera's at different points in space without using
fuel 'jets'! Spin an internal body one way and the rest of the
satellite rotates the other way."