The discovery of erathostene

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The discovery of erathostene

  1. 1. THE DISCOVERY OF ERATHOSTENE
  2. 2. How the Greeks calculated the radius of the earth
  3. 3. Summary <ul><li>Introduction : The Greek scientists </li></ul><ul><li>The life of Erathostene </li></ul><ul><li>The measurement of the radius of the earth </li></ul><ul><li>The impact of this discovery </li></ul>
  4. 4. The Antique Greek world had a major role in the development of the Western civilization <ul><li>Founders of: </li></ul><ul><li>Philosophy </li></ul><ul><li>Démocracy </li></ul><ul><li>Physics </li></ul><ul><li>Mathematics </li></ul><ul><li>Astronomy </li></ul>
  5. 5. Some scientists from the VII century BC to the II century BC <ul><li>In chronological order: </li></ul><ul><li>Thalès </li></ul><ul><li>Pythagore </li></ul><ul><li>Hippocrate </li></ul><ul><li>Aristote </li></ul><ul><li>Euclide </li></ul><ul><li>Archimède </li></ul><ul><li>Aristaque </li></ul><ul><li>Erathostène </li></ul><ul><li>Hipparque </li></ul><ul><li>Ptolémée </li></ul>
  6. 6. I . The life of Erathostène
  7. 7. II. The measurement of the radius of the earth Why at the same time the obelisk of Syene has not shadow, but that of Alexandria is in a clear projecting ?
  8. 8. Erathosthène’s mind
  9. 10. III. The impact of this discovery <ul><li>The circumference of the earth </li></ul><ul><li>Exploration possibilities </li></ul>
  10. 11. Named after Eratosthenes <ul><li>Eratosthenes crater on the moon </li></ul><ul><li>Eratosthenian period in the lunar geologic timescale </li></ul><ul><li>Eratosthène astéroid </li></ul>
  11. 12. THANK YOU FOR YOUR ATTENTION

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