The Librarian Who Measured the Earth

Author: Kathryn Lasky and Kevin Hawkes
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Description from Amazon.com: [Customer Review] This is a picture book format biography of Eratosthenes, who lived in Ancient Greece, focusing on how he calculated the size of the Earth using a mathematical formula and measurements taken by measuring shadows and length of footsteps from one location to another. Eratostehenes had many roles and talents, one being that he was a mathematician and author of books on several topics. He wrote the first geography book, which included the first map of the world and the first documentation of the size of the Earth. The publisher says this is for ages 4-8 however the math concept of the formula he used to determine the... [more at Amazon link below]
Available Online: Amazon $8.49 (prices include shipping)
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