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Ptolemy discovered that the Moon, Mercury, Venus, and the Sun all revolved around Earth. This helped and continues to help us with discoveries of our solar system
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He invented a system of latitude and longitude, this is important because we use latitude and longitude to give exact locations
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Discovered that earth and other planets revolve the sun. Leading to the advancement and accuracy in astronomical tools
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In 1572 Brahe discovered a new star. The star was one of the fixed stars, which were thought to be perfect and unchanging
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Discovered the Keplerian Telescope. This is important because with this we discovered hundreds of Earth-size and smaller planets in the Milky Way
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Newton discovered gravity. This is important because gravity helped keep the planets rotating around the sun
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Albert discovered E=Mc^2. This was important because it was a success of fundamental physics power