Eratosthenes Eratosthenes was born in Cyrene. There he read to the highest grade a vertical well near Syene. At twelve noon once a year, the well was totally lit up by the suns rays. He measured the weight down of its shadow by placing a post on the shadow at that measure time and date. He in the end made an assumption that the cosmos 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 blush numbers smaller than any given number, which is still an cardinal 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 automatic avid himself to death. If you want to get a bountiful essay, edict it on our website:
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