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Bible Encyclopedias
Isaac Ibn Sid (Zag; Çag)

The 1901 Jewish Encyclopedia

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Isaac Israeli
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Spanish astronomer; flourished at Toledo in the second half of the thirteenth century. From the surname "haḤazzan," given him by Isaac Israeli ("Yesod'Olam," 4:30), it may be inferred that he was precentor at the synagogue. Isaac ibn Sid took a leading part in the compilation of the ALFONSINE TABLES. Isaac Israeli (ib.) states that he saw recorded in Isaac ibn Sid's own handwriting three observations of moon-eclipses made by him at the order of Alfonso. In official documents (De Castro, "Bibliotheca," 1:184b) Isaac ibn Sid is termed by Alfonso "our learned Rabbi Çag." In 1277 Isaac translated from the Arabic a work on the quadrant. His name is also connected with the invention of various instruments (De Castro, c. 1:144a, 156a, 157).

Bibliography:
  • Grätz, Gesch. 7:115;
  • Steinschneider, Hebr. Uebers. pp. 617 et seq.
G.
I. Br.
Bibliography Information
Singer, Isidore, Ph.D, Projector and Managing Editor. Entry for 'Isaac Ibn Sid (Zag; Çag)'. 1901 The Jewish Encyclopedia. https://www.studylight.org/​encyclopedias/​eng/​tje/​i/isaac-ibn-sid-zag-ag.html. 1901.
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