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Unit: _____________ Topic: __________________________

Unit: _____________ Topic: __________________________. Aristotle (350 B.C.) Greek. Formulated a picture of the solar system that put Earth at its center with all the other heavenly bodies orbiting around it. GEOCENTRIC model The orbits were described as perfect circles.

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Unit: _____________ Topic: __________________________

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  1. Unit: _____________ Topic: __________________________

  2. Aristotle (350 B.C.)Greek • Formulated a picture of the solar system that put Earth at its center with all the other heavenly bodies orbiting around it. • GEOCENTRIC model • The orbits were described as perfect circles.

  3. The retrograde (backward, looping) motion of Mars. A composite image created by superimposing images taken on twenty-nine different dates.

  4. The “Wanderers” • The Greeks continued to watch the night sky, • The Sun, moon, stars moved predictable orbit in the sky. • BUT, there were five “objects” that did not follow this regular, predictable motion • Once every year, they’d move BACKWARDS (retrograde) for a month or two!! • They “wandered”, thus called planetes (Mercury, Venus, Mars, Jupiter Saturn)

  5. Observations Watch the animation and make observations about the motions of the planets and the Sun on your handout • http://www.davidcolarusso.com/astro/

  6. Ptolemy (Greek) A.D. 140 • Attempted to makea MODELof the solar system that explained the motions of the planets you just observed! • The model had to be testable by predicting future motion of the planets What does Ptoloemy’s model look like? Then construct a model to explain the observed motion of the planets

  7. Ptolemy’s model of the Solar System/Universe Epicycle

  8. To be continued…. • http://www.youtube.com/watch?v=utH-GHH1FT8&feature=related • Ptolemy http://www.youtube.com/watch?v=GevV1yvMJbc History Channel

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