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He has calculated out the size of the earth. Is all about the day in the summer that the sun was just arriving above his village, and he had seen the distance of the shadow, then he uses it to calculate out the distance of the earth.
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Author of the book <<Almagest>>. This book is so important that all astronomer have to read his book.
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He is the person who has created Heliocentric. The reason is during the time Geocentric doesn't sound right and simple for him, so he has made the suspicion on it.
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He is the person who has created the Geocentric. The reason he creates this is since a huge comet has landed in Danmark, and he has observed this comet.
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He has found out the pattern of the shape of planets. He found this out is to support Copernicus.
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Found out the gravity of earth. The reason is apple fall on his head.
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Einstein has created the theory of Static universe. The reason he creates this is since he thinks the size of the universe is limited, and even though, in his later life, he thinks this is the dumbest move he ever has and right now the people have to find out that this theory is surely a wrong theory.