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  1. 1. Aristarchus <ul><li>died at age 80 </li></ul><ul><li>310 BC – 230 BC </li></ul>
  2. 2. Home Country: Aristarchus <ul><li>Greek island, Samos </li></ul>
  3. 3. Astronomic Accomplishment 1: Aristarchus <ul><li>first person to present an explicit argument for a heliocentric model of the solar system, placing the Sun, not the Earth, at the center of the known universe </li></ul>
  4. 4. Astronomic Accomplishment 2: Aristarchus <ul><li>he had both identified the central fire with the Sun, as well as putting other planets in correct order from the Sun </li></ul>
  5. 5. Interesting Fact 1: Aristarchus <ul><li>the view of Aristarchus conflicted with the common teaching of the astronomers </li></ul>
  6. 6. Interesting Fact 2: Aristarchus <ul><li>the crater Aristarchus on the Moon is named in his honor </li></ul>Aristarchus
  7. 7. Eratosthenes <ul><li>276 BC – 195 BC </li></ul><ul><li>died at 81 </li></ul>
  8. 8. Home Countries: Eratosthenes <ul><li>Cyrene, North Africa (now Shahhat, Libya) </li></ul><ul><li>Athens, Greece </li></ul><ul><li>Alexandria, Egypt </li></ul>
  9. 9. Astronomic Accomplishment 1: Eratosthenes <ul><li>measured the altitude of the noontime sun </li></ul>
  10. 10. Astronomic Accomplishment 2: Eratosthenes <ul><li>measured the diameter of the earth and the tilt of the earth's axis </li></ul>
  11. 11. Astronomic Accomplishment 3: Eratosthenes <ul><li>accurately calculated the distance from the earth to the sun and invented the leap day </li></ul>
  12. 12. Astronomic Accomplishment 4: Eratosthenes <ul><li>created a map of the world based on the available geographical knowledge of the era </li></ul>
  13. 13. Interesting Fact 1: Eratosthenes <ul><li>He was nicknamed Beta (the second letter of the Greek alphabet) because because he supposedly proved himself to be the second best in the world in almost any field also nicknamed Pentathlos because it’s used to describe someone who was well-rounded, or good at several different things. </li></ul>
  14. 14. Interesting Fact 2: Eratosthenes <ul><li>He was the librarian for the great </li></ul><ul><li>Alexandrian University after Ptolemy III of Egypt passed away. </li></ul>Ptolemy III Eratosthenes