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Tag: trigonometry

Engines Podcast

Engines of Our Ingenuity 1457: Eratosthenes’s Diameter of the Earth

Dr. John Lienhard

Posted on January 17, 2018 · Episode: 1457 Eratosthenes’s 2200 year old calculation of Earth’s size. Today, we measure the earth.

Tags alexandria astronomy Aswan columbus egypt geometry Magellan navigation Ptolemy trigonometry

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