notes1.4

notes1.4 - Configurations The inferior planets are and ....

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Lecture 1.4 The Work of Copernicus Occam's Razor Occam's Razor basically states that given two competing theories the , straightforward one is the more likely correct one. The Ptolemaic model was not particularly simple or straight forward. It also degraded over time needing parameters to be updated every hundred years or so. Heliocentric Model Basics Copernicus died in . Just before dying he published a book De Revolutionibus Orbium Coelestium or . In it he advocated a heliocentric model. Key propositions of the model were: the is not the center of the universe the are much farther away than the sun was the rotates on its axis motion is an apparent motion, not a physical backtracking Some of the advantages of the model is that it was: computationally still predicted motion predicted the relative to the planets In short, the model was easier and Copernicus showed how to set up the scale of the solar system. The Ptolemaic model did not predict the relative distances of the planets.
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Unformatted text preview: Configurations The inferior planets are and . The superior planets are , , . Elongation is the angle between and . The greatest elongation of Mercury is about 28. The greatest elongation of Venus is about . During superior conjunction the planet is the sun. Quadrature is the name given to a elongation of . Opposition is when a planet is . Sidereal period refers to the time it takes a planet to . Synodic period refers to the time it takes a planet and sun to come back to the same earth-planet-sun configuration. Heliocentric Problems The planetary orbits are not exactly . The orbital speeds of the planets are not . The moon orbited the earth and not the sun like all the other planets. Seemed out of place. And the heliocentric model was incompatible with Aristotelian physics. For example, it seemed improbable to many that the surface of the earth could spin so fast (over 1000 mph at the equator) and yet have people remain on it....
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This document was uploaded on 10/27/2011 for the course ASTR 104 at UNL.

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notes1.4 - Configurations The inferior planets are and ....

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