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In 240 B.C. he made the first accurate measurement at the Earth's circumference. It is important, because it still contributes to scientists studying the Earth.
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Approximately 150 B.C. Ptolemy modeled our solar system, which is important because it was the first real idea of our solar system
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He made the model of the solar system where the sun was the center. This is important, because it is an accurate depiction of the solar system.
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He recorded the positions of the planets approximately ten times more accurately than anyone else. This is important because it helped future scientists study the planets.
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Kepler came up with the three laws of planetary motion. It is important because it proved that planets move in an elliptical patetrn, and not perfect circles.
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Newton discovered the laws of motion, which is important because it set the standard for modern physics.
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He produced the theory of relativity, which revolutionized science. This theory also made nuclear weapons and power a possibility.