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I was chatting to a gent in an observatory and actually the "Dither" name came from more or less exactly what it sounds like. "Dithering around" in terms of not sitting still. It came from mounts (Mounting exactly what I do not recall) which had plain bearings, and they will suffer from stiction where they essentially lock up and take extra force to get moving if they sit still for any period of time, so they were "Dithered" by constantly sending small movements so they never sat still long enough for stiction to take effect.
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