What did Johannes Kepler do?

Answer 1

He simply discovered many things that makes technology where we are!

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In astronomy he used measurements made by Tycho Brahe to do many complicated calculations to discover the shape of the planets' orbits. The results were published as the three laws of planetary motion in 1618. They were found to give good results when used to predict the future positions of the planets. For this work Kepler is recognised as one of the founders of modern astronomy.

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Kepler worked with Tycho Brahe for several years. Brahe had no great skill in science or mathematics, but was a METICULOUS and precise observer. Based largely on Brahe's observations, Kepler was able to determine that the planet Mars - and by extension, all the other planets - traveled in elliptical paths under the influence of a force that was inversely proportional to the square of the distance between the Sun and the planet. This paved the way for Newton's development of calculus and the math that describes gravity.

Answer 2

Johannes Kepler was the man who disproved Copernicus' theory that the planets orbit the sun in an circular motion. Kepler proved that the planets orbit in an oval, or ellipticall, motion.