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Eratosthenes was a Greek scientific writer, astronomer, and poet, who made the first measurement of the size of earth for which any details are known
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Claudius Ptolemy was a Greek mathematician, astronomer, and geographer most of medieval astronomy and geography was built on his ideas. His world map, published as part of his treatise
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nicolaus copernicus was a mathematician and astronomer who proposed that the sun was stationary and the center of the universe and Earth revolved around it
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tycho brache was a danish astronomer whose work in developing astronomical instruments, measuring, and fixing the positions of the stars.
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Johannes Kepler was a German mathematician and astronomer who discovered that the earth and planets travel around the sun in elliptical orbits
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Issac newton was famous for building the first practical telescope, but also making a theory of universal gravity
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Albert Einstein was a theoretical physicist. he discovered the photoelectric effect in which electrically charged particles are released from within a material when it absorbs electromagnetic radiation