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| The Columbia Encyclopedia, Sixth Edition. 2001-07. |
| 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. |
| The Columbia Encyclopedia, Sixth Edition. Copyright © 2007 Columbia University Press. |
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