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• Erarhosthenis measured the earth's circumference using a stick (physical observation) and geometrical calculations.
• Pythagoras is the first proponent to say that the earth is not flat but cylindrical.
• Aristotle proposed a statement that the earth is not flat using a 4 argument theory.
• Phytagoras believed that the earth is cylindrical because of its perfect ground
• Aristotle believed that a circle is the most perfect and symmetrical shape.
• Greeks identified that the earth is not flat through the ship, stars, and shadow of the earth during eclipse.