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Discovered the circumference of the earth which helped immensely with navigation
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Created the geocentric theory which in the end was wrong but it is still something everyone around the World still learns about
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He determined that all the planets revolve around the sun this helped us understand the universe and how the planets moved together
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founded the supernova which was monumental to the discovery of elements heavier than iron and was believed to be a part of the formation of Earth
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Planets move faster the closer they are to the sun this is important because it became Kepler's second law
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Discovered the laws of gravity very important due to the fact that gravity is the reasons everything can exists the way it does and holds us here on earth
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He discovered the photoelectric effect it was significant cause it questioned the concepts of natural light