Johannes Kepler Inventions?

Johannes Kepler, a mathematician that lived in the 1500-1600s, was the first to discover that the earth and other planets had elliptical orbits around the sun, and not circular orbits as it had previously been thought. This was proven by three laws of planetary motion which he formulated.
Q&A Related to "Johannes Kepler Inventions?"
 He invented the use of BCE and CE. http://wiki.answers.com/Q/What_Johannes_Kepler_inv...
 Johannes Kepler invented log books that he used as a tool for calculating planetary http://www.chacha.com/question/what-did-johannes-k...
 Kepler invented the Keplerian Telescope, which was an improvement on Galileo's refracting telescope design. He invented the telescope in 1611. Source(s) http://en.wikipedia.org/wiki http://answers.yahoo.com/question/index?qid=201005...
 The keplerian telescope, which consists of two covex objective lens is made by Johannes Kepler made. Anonymous http://www.blurtit.com/q7750094.html