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Unformatted text preview: planet moved on a small circle whose center moved around earth on a larger circle Aristarchus-came up with the heliocentric model; putting the sun in the center of the universe Kepler’s laws- 1 st- planets orbit the sun in an ellipse, 2 nd- planets sweep equal areas in equal times around its orbit, 3 rd – p2 =a3 Tycho-made naked eye observations, best of his time, horrible at coming up with theories based on what he was able to see. His observations provided the data needed to improve the Copernican system Galileo- first to replicate a telescope, looked at the sun saw sun spots, finally proved the sun was the center of our solar system Retrograde motion- as earth passes a planet that planet appears to be moving backwards relative to the stars. Geocentric-the idea that the earth was the center of the universe Heliocentric-sun is the center of the universe, not the earth Celestial sphere-north and south celestial poles, ecliptic, celestial equator...
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This note was uploaded on 04/22/2008 for the course ASTRO 100 taught by Professor Cwfarriss during the Spring '08 term at Sonoma.
- Spring '08