Eratosthenes Eratosthenes was born in Cyrene. There he read to the highest percentage point a vertical well near Syene. At noonday once a year, the well was totally lit up by the suns rays. He measured the move of its shadow by placing a post on the shadow at that clock time and date. He finally made an assumption that the reality is orbitual and that the suns rays are parallel. Eratosthenes remembered from geometry that the size of the Earths center between Alexandria and Syrene equaled the size of the angle he had measured. The result he got was 250,000 stadia (about 46,250 km). Eratosthenes also determined the asynclitism of the Ecliptic, measured the tilt of the earths axis with great accuracy, prepared a star map containing 675 stars, suggested that a leap day be added every 4th year and tried to construct an accurately dated history.
He created the Sieve of Eratosthenes method of finding rash numbers smaller than any given number, which is still an beta hammer in number research today. Describing the fundamentals of astronomy in verse, he came up with a poem called Hermes. Eratosthenes finally died when he was 80 years old. Scientists say he volunteer avid himself to death. If you want to get a good essay, edict it on our website:
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