Johannes Kepler (December 27 1571 - November 15 1630) was a German mathematician, astronomer and astrologer, and a key figure in the 17th century astronomical revolution. He is best known for his eponymous laws of planetary motion, codified by later astronomers based on his works "Astronomia nova", "Harmonices Mundi", and "Epitome of Copernican Astronomy". Wikipedia
The definitive Wikipedia entry for Johannes Kepler. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/Johannes_Kepler
Johannes Kepler, 1571-1630. Harmonices mvndi libri v. Appendix habet comparationem huius operis cum Harmonices Cl. Ptolemi libro III, cumque Roberti de Fluctibus, dicti Flud. posner.library.cmu.edu/Posner/books/annotation.cgi?call=5...
In 1634, four years after his death, the most provocative and innovative of Johannes Keplers works was published by his son Ludwig Kepler, then a candidate for the doctorate in medicine. www.depauw.edu/sfs/backissues/8/christianson8art.htm
Astronomy History - Johannes Kepler - Brief biography highlighting his status as a defender of Copernicus and a formulator of planetary-motion laws. www.dmoz.org/Science/Astronomy/History/People/Kepler,_Joh...
Harmonies of the World, by Johannes Kepler, tr. Charles Glenn Wallis [1939], full text etext at sacred-texts.com www.sacred-texts.com/astro/how/index.htm
Kepler's philosophies on the harmony of the universe support his conviction that planetary configurations reveal the tenor of all earthly experience. Kepler was never afraid to challenge existing theory or question certain facets of astrological belief, y www.skyscript.co.uk/kepler2.html
A Armitage, John Kepler (1966). C Baumgardt, Johannes Kepler : Life and Letters (New York, N. Y., 1951). www-history.mcs.st-andrews.ac.uk/References/Kepler.html