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

By Dominique Raynaud

This publication offers the 1st severe variation of Ibn al-Haytham’s On the form of the Eclipse with English translation and observation, which files the 1st medical research of the digital camera obscura. On the form of the Eclipse contains pioneering study at the stipulations of formation of the picture, in a time deemed to be dedicated to aniconism. It additionally offers an early try to merge the 2 branches of old optics—the conception of sunshine and concept of vision.

What probably such a lot 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 dimension of the aperture, the focal size of the digital camera obscura, the gap and form of the celestial our bodies. this manner, he completed a radical realizing. This paintings represents a decisive step in either the heritage of optics and the applying of the experimental process that was once simply as effective in medieval Islam as today.

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

Sample text

I have used the diacritical marks sparingly to solve an ambiguity. 4. Tips on Reading This book is made up of two parts: the Critical Edition of the Arabic text with English Translation (Chapter 2) and the Commentary (Chapters 3–4). The Critical Edition uses two types of references: the minor clarifications and bibliographic references appear in footnotes; all significant issues that call for a substantial development are dealt with in the Commentary. A cross-referencing system has been put in place between the Critical Edition and the Commentary.

P23v If, at the time of the eclipse, the Sun is facing a dense body with a circular aperture, from each point of the self-luminous crescent,19 which is the part of the Sun, a light is emitted to the entire B83r area20 of the aperture and any following surface. It is thus clear that the light, coming from every point of the luminous part of the Sun to the aperture opposite the Sun, is in the form of a cone, whose apex is the point of that luminous part and the base is the plane of the aperture.

Ibn al-Haytham performed various experiments to test this property, especially in Prop. 3, dealing with the propagation of light in dusty chambers, and proved it to be true for the light of the Sun, the Moon, the fire and even accidental lights. Interestingly, Prop. 11 considers the light of the Sun at the time of the eclipse. 16. : “head” (‫)رأﺳﻪ‬. 17. p. ‬فيــه هـذه ا ـ ـ‬ ‫‪i] 16‬عـن ذلـك وا ــ ـ‬ ‫|| ‪ add F‬ا ـنمـا ]‪i‬فـانـه ‪ add F || 46 post‬وقـول ]‪i‬كـل ‪i || 46 ante‬ابتــداينــا ‪ BPO‬ابتــدأنـا ‪i] FL‬ابتــدأنـا ‪words om L || 45‬‬ ‫نقطـة منــه ‪46‬‬ ‫نقطـة مـن ]‪ i‬ـيخـرج مـن كـان ـ ـ‬ ‫علــى ‪i] om B || 50‬ضـوء ‪ ] om F || 50‬كتــابنــا فـي ‪ transp F || 48‬ـيخـرج منــه كـان ـ ـ‬ ‫لنقطـة وقـاعـدتـه ذلـك ا ــلثقـب‬ ‫شكـل ـمخـروط راسـه ـتلـك ا ــ ـ‬ ‫]‪ i‬ـمستــو ‪ BO || 54‬مـوازي ]‪i‬مـواز ‪ F || 53‬كـل ] ‪i3‬ذلـك ‪ i] marg B || 51‬ـ‬ ‫‪ BO‬مستوي‬ ‫‪45‬‬ ‫‪50‬‬ 34 On the Shape of the Eclipse a base of the cone.

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