By Dominique Raynaud
This ebook presents the 1st serious version of Ibn al-Haytham’s On the form of the Eclipse with English translation and statement, which documents the 1st medical research of the digicam 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 and merge the 2 branches of historic optics—the concept of sunshine and conception of vision.
What might be 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 via various all that may be replaced: the form and measurement of the aperture, the focal size of the digital camera obscura, the gap and form of the celestial our bodies. this manner, he accomplished an intensive realizing. This paintings represents a decisive step in either the background of optics and the appliance of the experimental approach that was once simply as effective in medieval Islam as today.
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Extra info for A Critical Edition of Ibn al-Haytham’s On the Shape of the Eclipse: The First Experimental Study of the Camera Obscura
Mathematics. The word ( ﺳ ـﻬ ـﻢsahm), literally “arrow,” occurs frequently in Ibn alHaytham’s text. , line FR of arc ŠFH (lines 623). The same word can refer to the “axis” ṢṬF of ¯ the light cone spread from the aperture (lines 130, 139) and, more critically, it can also refer to the “generatrix” SḤT of the same cone (line 135). Here any word-toword translation would fail to make the text clear. In view of this, the word sahm has been translated to “sagitta,” “axis” or “generatrix,” according to the context.
6, pp. 145–7). 5. Finally, he devotes a long passage to the study of the shape of the image as a function of the light source, by comparing how the images of the Sun and the Moon appear in the darkroom. He puts forward two arguments, one of them is mistaken and the other correct. He mistakenly claims that the ratio required for light to appear crescent-shaped is not met in the case of the Moon. However, he appropriately explains that the image of the Moon is even more rounded than that of the Sun, because its faintness leads to the vanishing of the tips and edges that receive less light than the center of the image.
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. In Chapter 2, at the start of an important passage, a footnote indicates the page of the Commentary where the passage is commented on. Conversely, in Chapters 3–4, any discussion is referred to the lines of the Critical Edition.