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From David Arditti in the UK (one of the guys on Damian Peach's astro email list):
"Interesting discussion - I agree with the conclusion. The apparent curved path is due to the fact that the frames are registered on the features of the moon's limb. Those features are rotating round the moon's centre slightly with changing libration. This is not a uniform motion, but a sinusoidal oscillation - hence the apparent curved path of Uranus. The movement of Uranus with respect to the centre of the moon would be close to a straight line."
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