Studies In The History Of Medieval Optics

In this selection of studies, J.L. Mancha explores aspects of the development of medieval optics and astronomy, including some medieval antecedents of the work of early modern astronomers. The articles deal with Latin, Hebrew and Arabic texts, and the process of translation and transmission of knowledge, and focus on three main themes. First, the theory and astronomical use of the pinhole camera in the 12th and 13th centuries; the texts edited here contain a solution to the problem of the formation of images cast by light through triangular apertures, equivalent to Kepler's, a description of the correct procedure for measuring solar apparent diameters using finite apertures, and a derivation of the Sun's eccentricity from its apparent diameters at apogee and perigee. Second, the characteristics of the Latin and Provençal versions of Levi ben Gerson's astronomical work, composed in collaboration with the author, as well as his tables and canons for finding syzygies and the mathematical methods used in the derivation of parameters. Third, different aspects of the survival of homocentric astronomy in the Middle Ages, especially al-Bitruji's model for trepidation and the technique for calculating the hippopede resulting from Eudoxan couples.

A major updating of scholarship on the philosophy and thought of Roger Bacon. In particular, it treats his philosophy of language, science and mathematics, moral philosophy, medicine, physics and metaphysics, and his history and sociology of religion.

A.C. Crombie is one of the best known writers on the history of Science. Science, Optics and Music in Medieval and Early Modern Thought brings together a coherent body of essays that complement his books and are of independent value. A.C. Crombie traces general themes in the development of Science: the Aristotelian inheritance and the importance of the search for logical explanation in the middle ages; the ambitions and limitations of experiment and quantification; changing attitudes to scientific progress; the relations between Science and the Arts, and between Mathematics, Music and Medical Science; and the study of the senses. In particular he shows how the mechanistic hypothesis stimulated the experimental and philosophical study of vision.

In this selection of studies, J.L. Mancha explores aspects of the development of medieval optics and astronomy, including some medieval antecedents of the work of early modern astronomers. The articles deal with Latin, Hebrew and Arabic texts, and the process of translation and transmission of knowledge, and focus on three main themes. First, the theory and astronomical use of the pinhole camera in the 12th and 13th centuries; the texts edited here contain a solution to the problem of the formation of images cast by light through triangular apertures, equivalent to Kepler's, a description of the correct procedure for measuring solar apparent diameters using finite apertures, and a derivation of the Sun's eccentricity from its apparent diameters at apogee and perigee. Second, the characteristics of the Latin and Provençal versions of Levi ben Gerson's astronomical work, composed in collaboration with the author, as well as his tables and canons for finding syzygies and the mathematical methods used in the derivation of parameters. Third, different aspects of the survival of homocentric astronomy in the Middle Ages, especially al-Bitruji's model for trepidation and the technique for calculating the hippopede resulting from Eudoxan couples.

During the later Middle Ages, new optical theories were introduced that located the power of sight not in the seeing subject, but in the passive object of vision. This shift had a powerful impact not only on medieval science but also on theories of knowledge, and this changing relationship of vision and knowledge was a crucial element in late medieval religious devotion. In Seeing through the Veil, Suzanne Conklin Akbari examines several late medieval allegories in the context of contemporary paradigm shifts in scientific and philosophical theories of vision. After a survey on the genre of allegory and an overview of medieval optical theories, Akbari delves into more detailed studies of several medieval literary works, including the Roman de la Rose, Dante's Vita Nuova, Convivio, and Commedia, and Chaucer's dream visions and Canterbury Tales. The final chapter, 'Division and Darkness, ' centres on the legacy of allegory in the fifteenth century. Offering a new interdisciplinary, synthetic approach to late medieval intellectual history and to major works within the medieval literary canon, Seeing through the Veil will be an essential resource to the study of medieval literature and culture, as well as philosophy, history of art, and history of science.

From its inception in Greek antiquity, the science of optics was aimed primarily at explaining sight and accounting for why things look as they do. By the end of the seventeenth century, however, the analytic focus of optics had shifted to light: its fundamental properties and such physical behaviors as reflection, refraction, and diffraction. This dramatic shift—which A. Mark Smith characterizes as the “Keplerian turn”—lies at the heart of this fascinating and pioneering study. Breaking from previous scholarship that sees Johannes Kepler as the culmination of a long-evolving optical tradition that traced back to Greek antiquity via the Muslim Middle Ages, Smith presents Kepler instead as marking a rupture with this tradition, arguing that his theory of retinal imaging, which was published in 1604, was instrumental in prompting the turn from sight to light. Kepler’s new theory of sight, Smith reveals, thus takes on true historical significance: by treating the eye as a mere light-focusing device rather than an image-producing instrument—as traditionally understood—Kepler’s account of retinal imaging helped spur the shift in analytic focus that eventually led to modern optics. A sweeping survey, From Sight to Light is poised to become the standard reference for historians of optics as well as those interested more broadly in the history of science, the history of art, and cultural and intellectual history.

In Measuring Shadows, Raz Chen-Morris demonstrates that a close study of Kepler’s Optics is essential to understanding his astronomical work and his scientific epistemology. He explores Kepler’s radical break from scientific and epistemological traditions and shows how the seventeenth-century astronomer posited new ways to view scientific truth and knowledge. Chen-Morris reveals how Kepler’s ideas about the formation of images on the retina and the geometrics of the camera obscura, as well as his astronomical observations, advanced the argument that physical reality could only be described through artificially produced shadows, reflections, and refractions. Breaking from medieval and Renaissance traditions that insisted upon direct sensory perception, Kepler advocated for instruments as mediators between the eye and physical reality, and for mathematical language to describe motion. It was only through this kind of knowledge, he argued, that observation could produce certainty about the heavens. Not only was this conception of visibility crucial to advancing the early modern understanding of vision and the retina, but it affected how people during that period approached and understood the world around them.