Johannes KeplerHe helps us study motions of the planets in the Solar System.

1571-1630Born in Weil der Stadt in Swabia, Germany

http://faculty.fortlewis.edu/tyler_c/classes/206/comic-kepler.jpghttp://ircamera.as.arizona.edu/NatSci102/NatSci102/text/extkepler_files/image002.jpg

Laws of motion

Law 1: The orbit of every planet is an ellipse sun at focus.

Law 2: A line joining a planet and the sun sweeps out equal areas during equal intervals of time.

Law 3: The square of the orbital period of a planet is directly proportional to the cube of the semi-major axis of its orbit.

How did Johanne change the world?No satellites and no Hubble Telescope.