Websites used
"Kepler's Discovery." Kepler's Discovery. N.p., n.d. Web. 20 May 2013.
"History Of Astronomy (Complete)." History Of Astronomy (Complete). N.p., n.d. Web. 20 May 2013.
Kepler: Home Page." Kepler: Home Page. N.p., n.d. Web. 20 May 2013.
JOHANNES KEPLER." JOHANNES KEPLER. N.p., n.d. Web. 20 May 2013
"Inventors." About.com. N.p., n.d. Web. 20 May 2013
"History Of Astronomy (Complete)." History Of Astronomy (Complete). N.p., n.d. Web. 20 May 2013.
Kepler: Home Page." Kepler: Home Page. N.p., n.d. Web. 20 May 2013.
JOHANNES KEPLER." JOHANNES KEPLER. N.p., n.d. Web. 20 May 2013
"Inventors." About.com. N.p., n.d. Web. 20 May 2013