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- RetrogradeImagine riding in a speeding train, and passing a slower train. Both trains are moving straight ahead, but as the trains are passing, the slower train appears to be moving backward, at least from the point of view of the riders on the fast train. This same effect occurs with the planets. As the Earth passes (or is passed by) other planets in the solar system, for a while, they...0 Commentaires 0 parts