Tycho Brahe
In Our Time: History
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The Ptolemaic Vision of the Universe
When he was growing up the mainstream understanding of the structure of the heavens was the Petolomac system. So we call it the Ptolemaic system after the late antique Alexandrian astronomer Claudius Ptolemy but the underpinnings are Aristotelian. There's a philosophical dimension to this notion of the cosmos as well as the mathematics of the models, the astronomical models. But didn't Aristotle say that the universe was unchanging? Yes but the circular motion of the heavenly bodies was not change as far as Aristotle was concerned.
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