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He used the sun to measure around the Earth. He proved that the Earth wasn't flat.
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He created a model of the solar system with everything revolving around the Earth. Many scientists followed and believed it for many years.
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He proposed a model of the solar system with the Earth's revolution around the sun. It changed the way scientists viewed the solar system.
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Built many instruments and used clocks and timekeepers in order find a way to see the stars. This is important because they were the first tools used to see space before the telescope.
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He tried to prove that there were 6 planets with a spherical orbit. This changed how scientists began to imagine the universe.
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He calculated three laws describing the motion of objects (Newton's Laws). He changed the way scientists viewed gravity.
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He suggested the laws of physics are the same across the universe, the speed of light is constant in a vacuum, and space and time are linked and distorted by gravity. This changed the way the universe was viewed.