13. What motions of the planets in our sky caused problems with the simplest worldview?
14. How did each worldview try to explain these complicated motions?
15. Who was the first person to come up with a coherent theory that correctly describes the motion of the planets? About when did this person live?
16. What fact did our currently accepted theory of planetary motion have trouble explaining? How long did it take to explain this away? Why was it so difficult to explain away?
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