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http://www.pbs.org/wnet/hawking/cosmostar/html/cstars_eratho.html

» Eratho [ Kids/Teens ] - Brief information on Eratosthenes, including when and where he was born, as well as later historians that followed up on his work of the stars.

http://www-history.mcs.st-andrews.ac.uk/Biographies/Eratosthenes.html

» Eratosthenes of Cyrene [ Teens/Mature Teens ] - Biography of the mathematician, geographer and astronomer born 276 BC in Cyrene, North Africa (now Shahhat, Libya). From The MacTutor History of Mathematics archive.

http://www.phys-astro.sonoma.edu/observatory/eratosthenes/

» The Eratosthenes Project [ Teens/Mature Teens ] - Gives information about the techniques and computations used by this ancient mathematician to find the circumference of the earth. Includes sample sketch and reconstructed map of the world.

http://en.wikipedia.org/wiki/Eratosthenes

» Wikipedia - Eratosthenes [ Teens/Mature Teens ] - Brief article covers his life and work. Includes links for further reading.

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