var tfd_html_birthday='

Johannes Kepler (1571)

Described by Carl Sagan as "the first astrophysicist and the last scientific astrologer," Johannes Kepler was a German astronomer, mathematician, and astrologer. A key figure in the 17th-century scientific revolution, Kepler derived the three famous laws of planetary motion, which established that the planets travel around the Sun in elliptical rather than circular orbits. When Kepler was six years old, his mother, who was later tried for witchcraft, took him to observe what phenomenon? More... Discuss
'; if (document.getElementById('tfd_birthday_div')) document.getElementById('tfd_birthday_div').innerHTML=tfd_html_birthday; else document.write(tfd_html_birthday); //Copyright 2009 Farlex, Inc.