By Dominique Raynaud
This ebook presents the 1st severe variation of Ibn al-Haytham’s On the form of the Eclipse with English translation and observation, which documents the 1st clinical 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 and merge the 2 branches of historic optics—the concept of sunshine and concept of vision.
What possibly 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 manner by means of various all that may be replaced: the form and dimension of the aperture, the focal size of the digital camera obscura, the space and form of the celestial our bodies. this manner, he accomplished an intensive knowing. This paintings represents a decisive step in either the historical past 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
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.
26 On the Shape of the Eclipse X Projection Plane Ẓ Moon A Ǧ H Sun D B Ṭ Ṯ Ḥ K Q G L N M Y F Ḫ Aperture Š Fig. 6. The Formation of the Image Diagram 1 (Plates, p. 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.
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A Critical Edition of Ibn al-Haytham’s On the Shape of the Eclipse: The First Experimental Study of the Camera Obscura by Dominique Raynaud