Week 2 DQs

Week 2 DQs - 1) Compare and contrast the Ptolemaic,...

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1) Compare and contrast the Ptolemaic, Tychonian, and Copernican models of the solar system. What was in the importance of stellar parallax with these models? The Ptolemaic model is geocentric and based on a uniform circular motion. Mercury and Venus were treated differently from the rest of the planets. The centers of the epicycles of Mercury and Venus had to remain on the Earth-Sun line as the sun circled Earth through the year. The Copernican system was also known, as the Heliocentric Model, was elegant and simple compared with the whirling epicycles and the off-center equants of the Ptolemaic system. With the sun at the center of the universe and the Earth rotated on its axis it revolves around the sun. The Tychonian model of the universe held that Earth was fixed at the center of the starry sphere, the moon and sun circled Earth, while the planets circled the sun. The importance of stellar parallax is by knowing the parallax of a star; the distance of the star from the earth can be determined using simple geometry and the properties of
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This note was uploaded on 01/17/2010 for the course PHY 110 taught by Professor Smith during the Spring '09 term at Upper Iowa.

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Week 2 DQs - 1) Compare and contrast the Ptolemaic,...

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