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In the Phaedrus Plato (427–347 B.C.) describes the universe as being a sphere. The earth is placed in the center of the heavens in the Phaedo. It has no reason to fall one way rather than another, and hence remains fixed in the middle (Phaedo 107–110). It is an unsupported sphere, our earth, around which the universe rotates diurnally (Republic 616–617). The spheres of the fixed stars—and the seven ‘planets’—are all set on a celestial spindle. But Plato never notes that the planets fail to move in parallel lines or that their orbits have different inclinations to the ecliptic.

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Plato

  • 章节

  • 发表日期：

    2026年

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  • Norwood Russell Hanson

摘要

In the Phaedrus Plato (427–347 B.C.) describes the universe as being a sphere. The earth is placed in the center of the heavens in the Phaedo. It has no reason to fall one way rather than another, and hence remains fixed in the middle (Phaedo 107–110). It is an unsupported sphere, our earth, around which the universe rotates diurnally (Republic 616–617). The spheres of the fixed stars—and the seven ‘planets’—are all set on a celestial spindle. But Plato never notes that the planets fail to move in parallel lines or that their orbits have different inclinations to the ecliptic.