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  • Glide: 1
  • The earth is a flat disk?
  • Hush! It's shaped like an oyster
  • The Earth is spherical because of these observations I had...
  • The Earth's shape is round. I believe the sphere is the perfect geometric shape and the gods would only create a perfect world.
  • No! It's shaped like a cylinder!
  • Glide: 2
  • Back then, about 600-800 B.C., many people believed in different shapes of the Earth...
  • Till one fine day in 500 B.C., philosopher and mathematician Pythagoras announced that he believed the Earth is round.
  • Not only the earth is circular, but also that it is also a sphere of no great size: otherwise, the effect of a slight change of place wouldn't be quickly apparent.
  • The stars are constantly indifferent positions depending on a person's location.
  • Glide: 3
  • As time passed...Aristotle, one of the great philosophers, started collecting evidence that the earth is indeed round. It is spherical to be specific.
  • Hmm, the stick cast a shadow here but on the last place I went to, it doesn't. I can determine the circumference of the Earth with this evidence.
  • One of the evidences was observed from eclipses...
  • He added that the overhead stars are significantly changed by minute change of position to south or north, and the stars seen are different, as one moves north or south.
  • Years later... Another philosopher, Eratosthenes, further proved that the earth is round and determined its circumference using a stick and the sun.
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