By Dominique Raynaud

This booklet presents the 1st severe variation of Ibn al-Haytham’s On the form of the Eclipse with English translation and remark, which files the 1st scientific analysis 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 offers an early try to merge the two branches of historic optics―the conception of sunshine and thought of vision.

What probably such a lot strongly characterizes this treatise is the shut interplay of a geometrical research of sunshine and experimental reasoning. Ibn al-Haytham performed his experiments in a scientific approach by way of various all which 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 figuring out. This paintings represents a decisive step in either the heritage of optics and the applying of the experimental procedure that was once simply as effective in medieval Islam as today.

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Additional resources for A Critical Edition of Ibn al-Haytham’s On the Shape of the Eclipse: The First Experimental Study of the Camera Obscura (Sources and Studies in the ... Sciences) (English, Arabic and Greek Edition)

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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.

Arabic has two words for light: ‫( ﺿ ـﻮء‬ḍaw’) refers to the light of the light source per se, whereas ‫ﻧ ـﻮر‬ (nūr) refers to the effect of the light on surrounding objects. This is roughly the difference between the light emitted and the light received. ” Surprisingly enough, there is no difference whatsoever in On the Shape of the Eclipse, where the term ḍaw’ is used throughout in all three situations. ” 20. 2 The Point-Analysis of the Image> It is clear from what we have mentioned P24r that if, at the time of the eclipse, the Sun is facing a dense body with a circular aperture, its light emerges from every point of the visible crescent of the Sun to the aperture, extends to the plane parallel to the aperture and forms a circular light on this plane.

19: “From every part of every self-luminous body, light radiates in every straight line extending from that part” (Sabra 1989, I: 20), a matter which is studied in depth in Chapter 3. 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.

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