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He made the first measurement of the Earth at 24,660 miles round and was only 211 off our true measurement. Again the first!
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He is known for his controversial geocentric theory of the universe, which would form the basis of our understanding of the motions of stars and planets for over than a thousand years.
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He proposed a heliocentric system, that the planets orbit around the Sun. He was not the first but he was the one to bring to the world during Renaissance. This is how we see the Solar system today this is why this was so important.
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Discovery of the "new star" the was brighter than the Moon. He paved the for future discoveries. His use of instruments and the fixing of star positions
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Most famous for his formulation of the three laws of motion—the basic principles of modern physics.
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In his 5th paper, matter and energy can be interchangeable at the atomic level specifically, that E=mc2. This is the most famous mathematical equation.
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Kepler's First Law: each planet's orbit about the Sun is an ellipse. This is so important as this is how we view the solar system today. This law and his other two are still what we study.
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