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He calculated the tilt of Earth's axis, determining that led to the development of longitude and latitude
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Created the first planetary model that was geocentric and helped to launch the study of outer space
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Copernicus improved the heliocentric model, he was not the original theorizer of the model, but he made the planetary orbits circular
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1577: he reconstructed the orbits of the planets making them not solid like was thought by Aristole
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He developed the three laws of Planetary motion and this is important because they say that the planets move in ellipses instead of circles
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Created the Law of gravity and it determined that all things are attracted to each other by gravity but some things more than others, that helped us understand how planets stay in orbit
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He published some papers and they included the theory of relativity that explains how light bends and moves