Gravity and the planets motion

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Gravity and the planets motion
Lecture 7
Today HOW? Next WHY?
Quiz from last class
4, 5, 9, 10
Calendar
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Eratosthenes (200 B.C)
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Aristarchus
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Ptolemaic system
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Aristarchus suggested an heliocentric system
Nobody believed him
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Planet?wanderer (in Greek)
movie
The motion of Mars
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Movie
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The scientific revolution
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Copernicus SUN IS IN THE CENTER
Occams razor.
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Movie
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Copernicus still had epicycles!!!!
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If Ptolemy was right, Venus should never be seen
more than half illuminated
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Tycho Brahe
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Cassiopeia
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Quiz (for next class) 3, 5,10
Homeworks chapter 4, sec 1, 2, 3, 4
Exercises (due next Wednesday) 9, 11