By Dominique Raynaud
This booklet offers the 1st severe variation of Ibn al-Haytham’s On the form of the Eclipse with English translation and remark, which documents the 1st clinical research of the digicam obscura. On the form of the Eclipse comprises pioneering study at the stipulations of formation of the picture, in a time deemed to be dedicated to aniconism. It additionally presents an early try to merge the 2 branches of historic optics—the thought of sunshine and idea 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 means via 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 fashion, he accomplished a radical realizing. This paintings represents a decisive step in either the historical past of optics and the applying of the experimental strategy that used to be 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 adjective ( اﻟ ـﻬ ـﻼل اﻟ ـﻤ ـﻀ ـﻲءal-hilāl al-muḍī’) has many occurrences in Ibn al-Haytham’s text. It has been split into two for the sake of disambiguation. I have translated it as “self-luminous crescent” (line 60) when the term unequivocally refers 22 On the Shape of the Eclipse to the remaining part of the Sun during the eclipse, while preferring “light crescent” (line 358) when the term refers to the image cast on the projection plane of the darkroom. The terms have been translated consistently, so that the reader can track a word in the text from the Arabic-English Glossary appended to this book.
3. Editorial Procedures 1. Scientific Vocabulary Ibn al-Haytham’s phrasing is fully explicit, a trait that may appear redundant to more than one reader. Faced with this situation, Wiedemann chose to shorten Ibn alHaytham’s text by encoding repeating words with symbols, such as S (Sonne), L This Edition 21 (Loch), W (Wand) and so on. I have opted for a literal translation instead because, given that scholars disagree about Ibn al-Haytham’s legacy, one purpose of this edition is to prepare a comparison of the texts available on the camera obscura.
Its base is an arc of the perimeter of the circle bounding the Sun sphere, its center is under the center of the Sun and nearby the center of the Sun. The concave surface is tangent to the Moon sphere along an arc of the circle that bounds the Moon sphere. Then, this concave surface of the cone extends to the Sun sphere. The Sun sphere is cut off along an arc of a circle equal to the circle, which is the base of the convex surface, for the cone B84v bounding the Sun sphere is equal to the cone bounding the Moon sphere, as shown by the mathematicians.