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Περὶ Τροπῶν Ἡλίου

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Chapter Summary

This chapter focuses on the sun's motion, which logically follows on from its substance, size and shape. The doxai present are not descriptive but focus on the cause, i.e. why it moves from solstice to solstice. The structure of the chapter is reconstructed as follows. There is a list of four small groups of doxai forming a type C diaeresis. The first three each present different explanations, involving air, celestial motions and sustenance respectively. The fourth adds an opposition involving two kinds of spiral motion which is a partial reprise of the second group. If there are nine doxai, then the standard view of Plato-Pythagoras-Aristotle occupies the position right in the middle, which may be not entirely coincidental.

Keywords: doxai; sun



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