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He made the first accurate messurement of the circumference of the Earth. It was able to help us grasp a better understanding of our solar system
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He beleived the Earth was the center of the universe. This is important becausee it allowed people to question what he thought and figure out it wasnt true.
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He came up with the theory that the Sun is at the center of the Universe, and the Earth spins on its axis once daily and goes around the sun annually. This is called the heliocentric, or Sun-centered, system
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He came up with the Tychonic System which stated the sun, moon, and stars circle Earth, while the five planets orbit the sun
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the three laws stated (1) All planets move around the Sun in elliptical orbits, having the Sun as one of the foci. (2) A radius vector joining any planet to the Sun sweeps out equal areas in equal lengths of time. (3) The squares of the sidereal periods (of revolution) of the planets are directly proportional to the cubes of their mean distances from the Sun. This helped us fully understand how our solar system worked
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He was the one that discovered gravity and figured out that the force of gravity was what kept the planets in their orbit
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Best known for his Special and General Theory of Relativity and the concept of mass-energy equivalence expressed by the famous equation, E = mc2.