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Was very important in the discovery of first calculating Earth's circumference.
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Based on observations he made with his naked eye, Ptolemy saw the Universe as a set of nested, transparent spheres, with Earth in the center. He posited that the Moon, Mercury, Venus, and the Sun all revolved around Earth.
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First scientist to propose that Earth and other planets revolved around the sun. This was very important as it was the first Heliocentric Theory of the Universe.
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He showed irregularities in the moon's orbit and discovered a new star in the Cassiopeia Formation. Some of his discoveries led to the improved observational equipment.
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He discovered that the orbit of Mars was an ellipse. Very important because it led to further exploration of planets other than Earth. 1600
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He discovered the generalised binomial theorem and began to develop a mathematical theory that later became calculus
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Known for his Theory of Relativity which was widely important to quantum mechanics.