A Critical Edition of Ibn al-Haytham’s On the Shape of the by Dominique Raynaud

By Dominique Raynaud

This booklet presents the 1st severe variation of Ibn al-Haytham’s On the form of the Eclipse with English translation and statement, which documents the 1st clinical research of the digital camera obscura. On the form of the Eclipse contains pioneering examine at the stipulations of formation of the picture, in a time deemed to be devoted to aniconism. It additionally presents an early try to merge the 2 branches of old optics—the idea of sunshine and thought of vision.

What probably so much strongly characterizes this treatiseis the shut interplay of a geometrical research of sunshine and experimental reasoning. Ibn al-Haytham performed his experiments in a scientific approach through various all which may be replaced: the form and measurement of the aperture, the focal size of the digicam obscura, the gap and form of the celestial our bodies. this fashion, he accomplished an intensive knowing. This paintings represents a decisive step in either the historical past of optics and the applying of the experimental process that used to be simply as effective in medieval Islam as today.

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Additional resources for A Critical Edition of Ibn al-Haytham’s On the Shape of the Eclipse: The First Experimental Study of the Camera Obscura

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The Stemma of Diagrams The analysis of the handwritten diagrams follows in the same footsteps. ), and detected throughout the manuscripts by visual inspection. Then a matrix of characters is made of six taxa (the five extant manuscripts of Ibn al-Haytham’s work and the out-group, which simply consists of the list of common features) and of the 96 errors that we have detected in diagrams. 20 On the Shape of the Eclipse When PHYLIP’s Maximum Parsimony Algorithm is applied to the matrix of char- acters recording the errors defined and surveyed, again one most parsimonious tree is found (Fig.

261) represents the three crescent-shaped figures one above the other as in Fig. 6. Diagram 2 is a lemma stated in view of the next proposition. Diagram 3 reproduces Diagram 1 with some additional features showing how the crescent-shaped figures overlap one another. Diagram 4 is a detailed view of the two crescent-shaped figures ŠYḪF and KLMN in Diagram 3. 5. Transliteration Given the large number of points in Ibn al-Haytham’s diagrams, I have decided not to transliterate the Arabic letters according to the Kennedy-Hermelink system (Kennedy 1991–2), because beyond the 20th Arabic letter, arbitrary Latin and Greek letters need to be introduced.

148–59). This Edition 25 2. Reading the Diagrams The diagrams of On the Shape of the Eclipse have been critically edited. The diagrams thus retain the original proportions found in manuscripts. Since the overall device cannot be depicted to scale—the Sun-Earth distance is about 1010 times more than the focal distance of the darkroom—there is no perfect picture. The reader is here provided with a three-dimensional view of the device. ) X Projection Plane Moon A Ǧ Sun D Y B Ḥ F Aperture Š Ḫ T Fig.

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