Johannes+Kepler+P5

== ===Born: 27 Dec 1571 in Weil der Stadt, Württemberg, Holy Roman Empire (now Germany) Died: 15 Nov 1630 in Regensburg (now in Germany) Discovering the three laws of planetary motion discovered two new regular polyhedra the first mathematical treatment of close packing of equal spheres gave the first proof of how logarithms worked devised a method of finding the volumes of===

===**Kepler wrote a story, "Somnium," that wasn't published until after his death. In the story a man travels to the moon in a dream. Kepler accurately described the surface of the moon as dust and rocks. Kepler did not published this book because people will not believe him calculation.** **Kepler's Laws of Planetary Motion** Kepler was assigned the task by Tycho Brahe to analyze the observations that Tycho had made of Mars. Of all the planets, the predicted position of Mars had the largest errors and therefore posed the greatest problem. Tycho's data were the best available before the invention of the telescope and the accuracy was good enough for Kepler to show that Mars' orbit would precisely fit an ellipse. In 1605 he announced Laws are :===

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 * Law 1: the orbit of a planet/comet around the sun is an ellipse with the Sun’s center of mass at one focus.
 * Law 2: A line joining a planet/comet in the Sun’s sweep out equal areas in equal intervals of time.
 * Law 3: The major squares of the periods of the planets are proportional to the cubes of their semi major axes
 * [|**http://www.who2.com/johanneskepler.html**] http://www-history.mcs.st-andrews.ac.uk/Biographies/Kepler.html