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Measuring the Earth with a Stick and Sand
How Eratosthenes measured Earth's circumference in 240 BC using shadows, geometry, and a stick in the sand without leaving Alexandria.
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📁 Discoveries
Measuring the Earth with a Stick and Sand
How Eratosthenes measured Earth's circumference in 240 BC using shadows, geometry, and a stick in t…
📁 Rivalries
How Math Stopped a War in 585 BC
Thales of Miletus stopped a war in 585 BC using math. See how geometry predicted an eclipse and for…
📁 Tragedies
Thales Measured the Heavens with a Stick
Thales of Miletus used a wooden staff and shadow geometry to measure the heavens around 600 BC, tur…
📁 Discoveries
How an 8-Foot Pole Built a Capital
Discover how the Duke of Zhou used an 8-foot bamboo pole and sunlight to align the Western Zhou cap…
📁 Genius
When the King Yelled at the Sun
When the sun vanished at noon, King Tai Wu yelled at the sky. Wu Xian used oracle bones and math to…
📁 Genius
How One Rope Tamed Gravity in 2600 BC
Imhotep used a knotted rope and the Seked ratio to build the Step Pyramid. See how math beat gravit…