By Dominique Raynaud
This publication 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 clinical research of the digital camera obscura. On the form of the Eclipse contains pioneering learn at the stipulations of formation of the picture, in a time deemed to be devoted to aniconism. It additionally presents an early try and merge the 2 branches of historical optics—the conception of sunshine and conception of vision.
What possibly so much strongly characterizes this treatiseis the shut interplay of a geometrical research of sunshine and experimental reasoning. Ibn al-Haytham carried out his experiments in a scientific approach via 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 manner, he accomplished an intensive realizing. This paintings represents a decisive step in either the heritage of optics and the applying of the experimental technique 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
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. Optics. The adjective ( اﻟ ـﻬ ـﻼل اﻟ ـﻤ ـﻀ ـﻲءal-hilāl al-muḍī’) has many occurrences in Ibn al-Haytham’s text.
10 31 On the Shape of the Eclipse a and
The verbal forms ﻳـ ـﻜـ ـﻮن،( ﺗـ ـﻜـ ـﻮنyakūn/takawwūn, “he/she is”) and ﻳـ ـﺨـ ـﺮج،ﺗـ ـﺨـ ـﺮج (yakhruj/takharruj, “he/she comes out”) are muddled throughout the manuscripts. رأس ـinstead of ﺳﻬﻤـﺎ رأ ـ ـ Affixe pronouns are juxtaposed rather than attached: we read ﻫﻤـﺎ (rāsahumā, “their two apices”). All those peculiarities have been erased, while other spelling variants have been kept as long as the understanding of the text and ease of reading were not at stake. 3. Punctuation None of the manuscripts is puncutated with the use of commas, semicolons and full stops.
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