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Lecture03 - Lecture#3 Orbits and Gravity Laws of Planetary...

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1 Astro 102/104 1 Lecture #3: Orbits and Gravity Laws of Planetary Motion: – Kepler's Laws. – Newton's Laws. • Gravity. Planetary Orbits. Spacecraft Orbits. Astro 102/104 2 The Main Point Motions of planets, moons, and asteroids can be very accurately predicted because of the underlying laws of planetary motion and gravity discovered by Kepler and Newton. Astro 102/104 3 Laws of Planetary Motion Ptolemaic (geocentric) and Copernican (heliocentric) systems made specific predictions about where the planets would be over time. What was needed was high quality data to test these competing models. Tycho Brahe (1546-1601): 20+ years of careful measurements. Best data available, and pre-telescopic! Astro 102/104 4 The Scientific Method
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