Johannes Kepler was a mathematician, astrophysicist, and an astrologer. Kepler's theories on planetary motion & optics were ground breaking, but his wildly publicized defense of Copernicus caused him much trouble with the Church.
Johannes was born into poverty. Life was hard & he was also frail. Despite these hurdles Kepler had a strong intellect & earned a scholarship to study at the University of Tübingen. This came at a dangerous time in his country when Protestants & Catholics were engaged in war & his defense of Copernicus left him with no friends in either camp. Constantly relocating as a result, Kepler was still able to perfect his theories.
During this time he " published the Epitome Astronomiae in 1621. This was his most influential work and discussed all of heliocentric astronomy in a systematic way. He then went on to produce the Rudolphine Tables that Tycho had envisioned long ago. These included calculations using logarithms, which he developed, and provided perpetual tables for calculating planetary positions for any past or future date." Today he is remembered as one of the father's of modern astronomy & physics.
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