Title: 1656 SPHAERA by IOHANNES SACROBOSCO antique ILLUSTRATED astronomy Description: Sacrobosco (Iohannes) Sphaera...Opera & studio Franconis Burgersdicii Lugduni Batavorum [Leiden], Jean Elzevir, 1656 woodcut printer's device to title, numerous woodcut illustrations, bookplate of James S. Dearden, title with later ink date to foot and portion of loss at the margin, final f. with loss to foot but seemingly no text loss, some light soiling, later brown half morocco over marbled boards, [Willems 791] Size 3 3/4 by 6" Text in Latin Johannes de Sacrobosco, also written Ioannes de Sacro Bosco, later called John of Holywood or John of Holybush (c. 1195 – c. 1256), was a scholar, Catholic monk, and astronomer who taught at the University of Paris. He wrote a short introduction to the Hindu-Arabic numeral system. Judging from the number of manuscript copies that survive today, for the next 400 years it became the most widely read book on that subject. He also wrote a short textbook which was widely read and influential in Europe during the later medieval centuries as an introduction to astronomy. In his longest book, on the computation of the date of Easter, Sacrobosco correctly described the defects of the then-used Julian calendar, and recommended a solution similar to the modern Gregorian calendar three centuries before its implementation. Very little is known about the education and biography of Sacrobosco. For one thing, his year of death has been guessed at 1236, 1244, and 1256, each of which is plausible and each lacking adequate evidence.
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