hw 4 - 3. How did the Ptolemaic model explain retrograde...

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3. How did the Ptolemaic model explain retrograde motion? The Ptolemaic model used a system with a small circular motion on top of the motion on a larger circle roughly centered on the Earth (epicycle on top of deferent). Retrograde motion occurs whenever the planet is on the inside of the small circle, passing nearer to the Earth. 4. In what ways were the models of Ptolemy and Copernicus similar? The main similarity is that they were both based on Uniform Circular Motions. The Copernican model, however, was Much simpler, although it could not really predict planetary positions any better than the Ptolemaic model. They both produced errors in predicted positions by as much as 2 degrees. 8. How was Tycho 's model of the universe similar to the Ptolemaic model? How did it resemble the Copernican model? (a) Tycho Brahe's planetary system incorporated three elements of the Ptolemaic system: (1) Solid celestial sphere. (2) Motionless Earth at the center of the celestial sphere, and
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hw 4 - 3. How did the Ptolemaic model explain retrograde...

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