Shadows, Circles, and the Shape of the World: Eratosthenes and the Library of Alexandria

A journey to ancient Alexandria and Syene where Eratosthenes, head librarian, uses a simple shadow and a distance measured by bematists to estimate Earth's circumference with astonishing accuracy. This episode explores how cross-disciplinary curiosity—from geometry to surveying to astronomy—redefined our understanding of the world and highlighted the Library of Alexandria as a crucible of ideas.

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