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Parmenides discovered that the earth was round by the earth's shadow
Aristotle was influnced greatly by Plato who was influenced by parmenides. look it up, there's a bunch of things on Plato and parmenides.
Parmenides' only known work is a poem known as On Nature.
Parmenides, Socrates, Plato, Heraclitus, and Democritus.