The Columbia Encyclopedia: Sixth Edition. 2000.
Sacrobosco, Johannes de
(y hän´ s d s krb s´k) (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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