Background+Information

1.The diameter of the earth is 12,756km. The equatorial diameter is 40km wider than the polar diameter.  2. Eratosthenes was a greek mathematician, poet, athlete, geographer and an astronomer. Greek scholar of the third century BCE. First person to calculate the circumference of the earth. Created a map of the world. http://en.wikipedia.org/wiki/Eratosthenes. 3. Eratosthenes was born in Cyrene. Born in 276 died 194 BCE. 4. He measured the two shadows of the earth. 5.He created a map of the world. The way he was able to create the map, was knowledge of the available geography. 6.He was the chief librarian of the Great Library of Alexandria. 7.He was also said to be able to calculate the distance between the sun and earth. http://en.wikipedia.org/wiki/Eratosthenes 8.He died in the capital of Ptolemaic Egypt. 9. He worked with prime numbers. 10. He measured the distance to the sun 804,000,000 stadia and the distance to the moon as 780,000 stadia. 11. He worked out a calender that included leap years. http://www-groups.dcs.st-and.ac.uk/~history/Biographies/Eratosthenes.html

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