Includes bibliographical references (p. 406-417) and index.

Preliminary Material / Lodi Nauta and Arjo Vanderjagt -- Bringing Astronomical Instruments Back to Earth—The Geographical Data on Medieval Astrolabes (to circa 1100) / David A. King -- The Treatise on the Astrolabe by Rudolf of Bruges / Richard Lorch -- Horoscopes and History: Ibn 'Azzūz and His Retrospective Horoscopes Related to the Battle of El Salado (1340) / Julio Samsó -- The Names and Faces of the Hours / Francis Maddison and Anthony Turner -- 'Abd al-Masīḥ of Winchester / Charles Burnett -- Calcidius's Commentary on Plato's Timaeus in Latin Astronomy of the Ninth to Eleventh Centuries / Bruce S. Eastwood -- Sacrobosco Illustrated / Owen Gingerich -- Astronomy in the Medieval Spanish Jewish Community / Bernard R. Goldstein -- God, Science, and Natural Philosophy in the Late Middle Ages / Edward Grant -- A Strange Fact About Aristotelian Dynamics / Keith Hutchison -- The Works and Days of Simon Bredon, a Fourteenth-Century Astronomer and Physician / K.V. Snedegar -- A Humanist Reading of Boethius's Consolatio Philosophiae: The Commentary by Murmellius and Agricola (1514) / Lodi Nauta -- 1st Tschimhaus' Medicina mentis ein Ableger von Spinozas Methodologie? / Detlev Pätzold -- 'Something, I Know Not What'. The Concept of Substance in Early Modern Thought / Han van Ruler -- Les Vite di matematici Arabi de Bernardino Baldi(Urbino 1553-1617) / G. Federici Vescovini -- Bibliography of John D. North / Lodi Nauta and Arjo Vanderjagt -- Index of Personal Names / Lodi Nauta and Arjo Vanderjagt.

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The essays in this volume reflect the wide-ranging interests of John D. North, distinguished historian of science and philosophy. Section One has papers on horoscopes, astrolabes and time-reckoning, and it includes an edition of a twelfth-century treatise on the astrolabe and surveys of astrolabes. Section Two is devoted to the study of the medieval cosmos. These contributions discuss Calcidian astronomy, astronomy in the Spanish Jewish community, the role of God in scholastic natural philosophy, and other themes. New information is presented about previously unknown scholars such as Abd al-Masīḥ of Winchester and Simon Bredon. Section Three contains essays on philosophy and scholarship in the early modern period, including pieces about commentaries on Boethius’s Consolatio Philosophiae in the Northern Renaissance, Spinozistic philosophy, and the early modern concept of substance. These essays take up the various themes to which John D. North has made important contributions: the development of scientific knowledge and methodology, the style of scientific and philosophical thought, and the uses of scientific knowledge in the making of instruments or the casting of horoscopes: this book will be of much interest to all historians of science and philosophy. Contributors include: Charles Burnett, Bruce S. Eastwood, Owen Gingerich, Bernard R. Goldstein, Edward Grant, Keith Hutchison, David A. King, Richard Lorch, F.R. Maddison, Lodi Nauta, Detlev Pätzold, J.A. van Ruler, Julio Samsó, Keith Snedegar, A.J. Turner, Arjo Vanderjagt, and G. Frederici Vescovini.

Articles in English, 1 article each in French and German.