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1-18-2008 Lecture 7 - Keplers Law 1st Law The path of the...

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Kepler’s Law 1 st Law: The path of the planets about the sun are elliptical in shape, with the center of the sun being located at one focus. (The Law of Ellipses) 2 nd Law: An imaginary line drawn from the center of the sun to the center of the planet will sweep out equal areas in equal intervals of time. (The Law of Equal Areas) 3 rd Law: The ratio of the squares of the periods of any two planets is equal to the ratio of the cubes of their average distances from the sun. (The Law of Harmonies) Galileo Galilei (1564 – 1642) - First telescopic observations of the sky. - Wanted to connect physics on earth with the heavens. - Dialogue Concerning the Two Chief World Systems Galileo’s Observation - Galileo saw shadows cast by the mountains on the Moon. - He observed craters. - The Moon had a landscape; it was a “place”, not a perfect heavenly body - He discovered that Jupiter had 4 moons of its own. - Jupiter was the center of its own system.
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