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Week 3 Notes

Week 3 Notes - 4 Argument against his theory – the Earth...

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Earth; Moon; Greek Astronomy I. Greek Astronomers A. Aristotle 1. 384-322 B.C. 2. Ideas based on pure thought 3. Never attempted to experimentally test or verify 4. Noted Earth casts curved shadow onto the surface on the Moon during lunar eclipse and that all future lunar eclipses would show Earth’s shadow to be curved 5. Theorized that Earth must be round 6. Earliest model of Earth laying at the center of the universe (Geocentric) B. Eratosthenes 1. 276-194 B.C. 2. Used simple geometric reasoning to calculate the size of Earth 3. Measured the length of the shadow of a vertical stick and applying elementary trigonometry 4. Determined the angular displacement of the Sun from the vertical at Alexandria to be 72° C. Aristarchus 1. Proposed that all the planets revolve around the Sun 2. Earth rotates on its axis once each day – creating an apparent motion of the sky 3. His influence was overshadowed by Aristotle’s
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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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Week 3 Notes - 4 Argument against his theory – the Earth...

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