Sacrobosco, Johannes de

Sacrobosco, Johannes de yōhän´əs də săkrōbŏs´kō [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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