The World According to Columbus c. 1490
A map illustrating Christopher Columbus’s image of the world before his first voyage in 1492. It was based on a map by Toscanelli, depicting the planet about 25% smaller than it actually was, and ignored the (correct) measurements of Eratosthenes from some 1700 years earlier, compounded by his own wishful thinking and wrong mathematical assumptions. By Columbus’ estimate, Asia was about 2,500 miles west of Spain. He was mistaken by roughly 8,000 miles.
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