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Word Count: 203
Eratosthenes Eratosthenes was born in Cyrene There he read about a vertical well near Syene At noon once a year the well was totally lit up by the suns rays He measured the angle of its shadow by placing a post on the shadow at that time and date He finally made an assumption that the Earth is round 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 250000 stadia about 46250 km Eratosthenes also determined the obliquity 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 prime numbers smaller than any given number which is still an important tool 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 voluntary starved himself to death
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