June 11... Trojan War: Troy is sacked and burned, according to calculations by Eratosthenes.

Portrait of Eratosthenes

194 BC.Capital of Ptolemaic Egypt...Epic poet and Inventor.

He was the first person to prove that the Earth was round. He was the first to calculate the tilt of the Earth's axis (also with remarkable accuracy). He may also have accurately calculated the distance from the earth to the sun and invented the leap day.

Apparently the age of the Earth is 4.54 billion years (4.54 × 109 years ± 1%

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