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By A.I. Sabra

Working throughout the articles during this quantity is the topic of the appropriation and next naturalization of Greek technology via students on this planet of medieval Islam. the outlet paper provides the historiography of this technique, and the point of interest is then put on Ibn al-Haytham, essentially the most unique and influential figures of the eleventh century, and specifically in his contribution to the technology of optics, either mathematical and experimental, and the psychology of imaginative and prescient. Professor Sabra then keeps the research of the way Greek proposal was once constructed within the Islamic global with reports of labor in keeping with Euclid’s geometry and on evaluations of Ptolemaic astronomy. the ultimate articles flip particularly to questions within the background of common sense - Aristotelian syllogism, and Avicenna’s perspectives at the topic - subject of common sense.

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Extra resources for Optics, Astronomy and Logic: Studies in Arabic Science and Philosophy

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1 Petri N on ii Salacicnsis urius, nunc recens Allacen Arabis lo rtim n iitn et L a lin ita te in rO pticae U ’p t e m . et e d itm . S42V Alhazeni Arabis I . i b r i e d iti. E iu sd em lib er D e crepu sculis et n u b iu m ascen sionibus. Ite m lorus T h u rin g o p o lo n i L ib ri ra ti, et in illu stra ti A lhnzenum ro m m e n ta riif. n avigan di CCS P l i i n e t a r u r n X. lib ri O m nes a u cti. nei*o (Basilcae, 1572). 3 Petri X o iiii Salaciensis tio n e ium o m n iu m e ditris th esa u n is.

130, p. 112, N o. 148, p. 123. 38 See H erm elink, op. cit. A v e n o « , T afsir M d ba'ad a t-fabi'at, ed. M. Bouyges (B eirut, 1942), Vol. 2, p. 665. T h e sentence referring to Ibn M u'adh is missing from th e L atin translation; see A ristotelis M etaph ysicoru m lib r i K i l l . C um A verrois . . C o m m en tariis (A ristotelis O pera cum A verrois C om m en tariis, V ol. V l l l , V enetiis, 1562) (repro­ d u ced ph otognip hicallv, Frankfurt am M ain, 1962). fol. 137’ H -I . • 40 T a fsir .

184*'] the images (sing, khaydl) of the two points on the arc. He then says th a t these two points and the first two points which are the extremities of the arc, (and) w’hich are on the surface of the m irror, are all either on a straig h t line [A: fol. 18''] or on a curved (niuqawwas) line whose convexity is towards the eye. H ed id not, however, show th a t it is possible for these points to be on a stra ig h t line, or on a convex or a concave line. And unless he show's this possibility, and (also) shows every one of the positions (au'4d‘) through which each one of the images is produced, he cannot judge the concave arc to be seen in these three positions, nor can he judge this proposition (qadiyya) to be true.

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