http://en.wikipedia.org/wiki/Eratosthenes
He is best known for being the first person to calculate the circumference of the Earth, which he did by applying a measuring system using stades, or the length of stadia during that time period. His calculation was remarkably accurate. He was also the first to calculate the tilt of the Earth's axis (again with remarkable accuracy). Additionally, he may have accurately calculated the distance from the Earth to the Sun and invented the leap day.[4] He created the first map of the world incorporating parallels and meridians, based on the available geographical knowledge of the era.
Born 276 BC Cyrene
Died 194 BC Alexandria
Thats right more than 2000+ years of knowing the earth is curved, and its size.
This man 2000 years ago, came within 2% of the real messurements (used today).
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