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A 16th-Century Astronomy Book Featured “Analog Computers” to Calculate the Shape of the Moon, the Position of the Sun, and More

Pop-up book enthusiasts like Ellen Rubin will know what volvelles are; you and I may not, but if you’ve ever moved a paper wheel or slider on a page, you’ve used one. The volvelle first emerged in the medieval era, not as an amusement to liven up children’s books but as a kind of “analog computer” embedded in serious scientific works. “The volvelles make the practical nature of cosmography clear,” writes Katie Taylor at Cambridge’s Whipple Library, which holds a copy of Cosmographia. “Read...
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