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Unformatted text preview: 4. Argument against his theory – the Earth doesn’t feel as if it’s moving and if it were moving wouldn’t there be a strong wind as the revolves at high speeds around the Sun D. Hipparchus 1. Second century B.C. 2. Classified the naked-eye stars into six groups a) Brightest stars first magnitude Earth; Moon; Greek Astronomy b) Next brightest stars second magnitude c) Faintest stars visible to the naked eye sixth magnitude E. Ptolemy 1. A.D. 140 2. Most complete geocentric model of all time 3. Ptolemaic model – explains the observed paths of the five planets then known, as well as the paths of the Sun and the Moon a) Requires no fewer than 80 distinct circles 4. Syntaxis – provided the intellectual framework for all discussion of the universe for well over a thousand years...
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- Fall '08
- Astronomy, Greek astronomy, I. Greek Astronomers