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.Unit: Ancient Astronomy: Aristotle's Geocentric Model

Explore how Aristotle's model placed Earth at the center of the solar system, observing the celestial bodies' predictable orbits. Discover Ptolemy's attempts to explain planetary motions. Dive into ancient Greek astronomy with animations and historical insights.

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.Unit: Ancient Astronomy: Aristotle's Geocentric Model

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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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