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This is a print on demand edition of an important, hard-to-find publication.

Abraham Zacut (1452-1515) of Salamanca was an outstanding intellectual figure in the Spanish Jewish community on the eve of the expulsion in 1492. His scientific work began in the 1470s, & continued in exile, in Portugal, N. Africa, & ultimately in Jerusalem. This monograph focuses on some of his important contributions to astronomy, namely, those that appear in the book published in Leiria, Portugal, in 1496, generally known as the "Almanach ...

This book provides a unique contribution to philosophy of science from the perspective of the practice of science. It focuses on processes that generate scientific knowledge and seeks general and universal features that characterize scientific practice, features that are inherent to the practice of science. Science is an activity, and the scientist is an agent who pursues some practice, which in one way or another engages evidence. In science,...

It would seem that S. Munk was the first modern scholar to draw attention to the significance of Levi ben Gerson's Astronomy, surely the most original work on astronomy written in Hebrew in the Middle Ages. Munk (1859, p. 500) called for a specialist to undertake a serious study of this work, but there was little response to his plea in the succeeding century. Indeed, this is the first edition of the Hebrew text of any part of Levi's Astronomy...