AST 101 Lecture Notes - Lecture 10: Uraniborg, Deferent And Epicycle, Semi-Major And Semi-Minor Axes

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Check your exam scores on blackboard; if they"re not right, tell me. There are some entry errors, and a bug affecting people whose names start with. There are two ways you can demonstrate that you"re an a student: He would much rather ask that you do the difficult things on an exam than easy things. Scale - 80+: a, 70+: b, 60+: c, 50+: d. We left our story with two plausible models for the heavens: The planets (and everything else) revolve around earth. Inelegant system of epicycles needed to get planets right. Everything moved in circles (elegant per greeks: earth and humanity at the center (theologically not challenging, very accurate predictions. Earth is one of many planets, all orbiting the sun. Matched galileo"s observations: moons of jupiter, phases of venus. Built a fancy castle called uraniborg to do research. Levied huge taxes on peasants to pay for it.

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