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Medieval people took their views on astronomy mostly from two great books, the Almagest and the Tetrabiblos, both by Claudius Ptolemaeus, or Ptolemy. He said there were two parts of astronomy, the easy and accurate part, and the hard part. The easy and accurate part was about predicting dates of the equinoxes, positions of the planets, phases of the moon, and so on, by mathematical calculations. The hard part was what we would call Astrology, which was used to predict things about people's lives.

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15y ago

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