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1Astro 102/1041Lecture #3: Orbits and Gravity•Laws of Planetary Motion:– Kepler's Laws.– Newton's Laws.• Gravity.•Planetary Orbits.•Spacecraft Orbits.Astro 102/1042The Main PointMotions 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 102/1043Laws 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 datato test these competing models.•Tycho Brahe (1546-1601): –20+ years of careful measurements.–Best data available, and pre-telescopic!Astro 102/1044The Scientific Method
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