Jacob ben David ben Yom Tov

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Jacob ben David ben Yom Tov (also Yomtob or Jomtob or Bonjourn or Bonet or Po'el or Fu'al)[1] was a Catalan Jewish astronomer and astrologer. He lived, probably at Perpignan, in southern France in the fourteenth century.

He was the author of astronomical tables prepared at Perpignan in 1361. These tables, still extant in manuscript (Bibliothèque Nationale, Paris, MS. No. 10,901; Adolf Neubauer, "Cat. Bodl. Hebr. MSS." No. 2072, 2), enjoyed a great reputation. They were translated into Latin in the fifteenth century, and were the subject of many Hebrew commentaries, among which was one written by Joseph ben Saul Ḳimḥi (Vatican MSS. Nos. i., v., 1, 7). Many manuscripts of these tables were retranslated from Latin into Hebrew.

His father David ben Yom-Tov, also called David Bongoron, was identified in the past with the Portuguese Jewish philosopher David ben Yom-Tov ibn Bilia by some scholars, including the nineteenth century scholar Moritz Steinschneider. However the two are now believed to have been separate individuals.


  • José Chabás (December 1991), "The astronomical tables of Jacob ben David Bonjorn", Archive for History of Exact Sciences, 42 (4), 279–314. doi:10.1007/BF00375156
  • Josep Chabas i Bergon, Antoni Roca i Rossell, and Xavier Rodriguez i Gil (1992), L'astronomia de Jacob ben David Bonjorn. (in Catalan). Barcelona: Institut d'estudis catalans. ISBN 84-7283-216-3. Google books (Review)
  • Gerrit Bos, Charles Burnett, and Tzvi Langermann (2005), "Hebrew Medical Astrology: David Ben Yom Tov, Kelal Qaṭan: Original Hebrew Text, Medieval Latin Translation, Modern English Translation", Transactions of the American Philosophical Society (New Series) 95 (5), pp. i, iii, v-vii, ix, 1-61, 63-121

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 This article incorporates text from a publication now in the public domainSinger, Isidore; et al., eds. (1901–1906). "article name needed". Jewish Encyclopedia. New York: Funk & Wagnalls Company.