The “Table”Kepler’s First LawKepler’s Second LawKepler’s Third LawThe “Table” Ptolemy (= Pre-Copernician)Copernicus Brahe Galilei KeplerPlanet … … rotates about… rotates about… rotates about… rotates about… rotates aboutSun Earth [Center] Earth [Center] [Center]Earth [Center] Sun [Center] Sun SunMoon Earth Earth Earth Earth EarthMercury Earth Sun Sun Sun SunVenus Earth Sun Sun Sun SunMars Earth Sun Sun Sun SunJupiter Earth Sun Sun Sun SunSaturn Earth Sun Sun Sun SunKepler’s First Law•A planet’s orbit is an ellipse around the Sun, with the Sun as one of its focal pointsKepler’s Second Law•A line joining the Sun with a planet sweeps out equal area in equal time.Kepler’s Third Law•The ratio of the squares of the orbital periods of two planets equals the ratio of the cubes of their mean orbital
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