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Eratosthenes
Eratosthenes of Cyrene was a Greek polymath: a mathematician, geographer, poet, astronomer, and music theorist.
He was a man of learning, becoming the chief librarian at the Library of Alexandria.
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Who has calculated the circumference of the Earth?
The first person to determine the size of Earth was Eratosthenes of Cyrene, who produced a surprisingly good measurement using a simple scheme that combined geometrical calculations with physical observations and without leaving Egypt.
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Nicolaus Copernicus
The man who started the scientific revolution was a Renaissance mathematician and astronomer, Nicolaus Copernicus.
Copernicus developed a heliocentric alternative to Ptolemy's planetary system. His system placed the Sun at the center instead of the Earth. The detailed controversial t...
Alexandria during the third and second centuries BCE
Alexandria, with its Great Library, was marked as the intellectual capital of the world.
During the third century BCE, the Musaeum, an educational and research institution, was built in Alexandria. The Great Library was one part of the Musaeum and may have held around 700,...
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