01 - Kepler.notebook · 2020. 12. 9. · 01 Kepler.notebook 7 December 09, 2020 “Kepler’s third...

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01 Kepler.notebook 1 December 09, 2020

Transcript of 01 - Kepler.notebook · 2020. 12. 9. · 01 Kepler.notebook 7 December 09, 2020 “Kepler’s third...

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Planetary Models

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“Kepler’s first law:  The path of each planet about the sun is an ellipse with the sun at one focus.

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“Kepler’s second law:  Each planet moves so that an imaginary line drawn from the sun to the  planet sweeps out equal areas in equal periods of time.” 

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“Kepler’s third law:  The ratio of the squares of the periods of any two planets revolving about the  sun is equal to the ratio of the cubes of their mean distances from the sun.  That is, if T 1 and T2 represent the periods, and r1 and r2 represent their average distances from the sun, then

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