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Johannes de Sacrobosco, Mathematics, Biographies

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Johannes de Sacrobosco[yOhAn´us du sakrObos´kO] Pronunciation Key, or John of Hollywood, c.1200–1256, English mathematician and astronomer. He wrote several widely read and influential books: Algorismus, a study of arithmetic; a treatise on the calendar; and the most popular medieval introductory textbook on astronomy, the Tractatus de sphaera.

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