8 March 1618 Posted on March 7, 2014 by Staff Johannes Kepler finds the third law of planetary motion. Famous Words of Inspiration..."A good many young writers make the mistake of enclosing a stamped, self-addressed envelope, big enough for the manuscript to come back in. This is too much of a temptation to the editor." Ring Lardner — Click here for more from Ring Lardner Related posts: 8 March 1983 8 March 1978 23 March 1983 3 March 1913