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(210 words)

, nūr al-dīn abū isḥāḳ , called Alpetragius by mediaeval European authors, a Spanish-Arab astronomer, the disciple and friend of Ibn Ṭufayl (about 600/1200). His astronomical theory, the origins of which must be sought in the return to Aristotelianism initiated by Ibn Bād̲j̲d̲j̲a and other Arab philosophers of Spain like Ibn Ṭufayl and the astronomer Ḏj̲ābir b. Afiaḥ, involved the reintroduction of the idea of impetus roughly formulated by Simplicius (6th century A.D.), the abandonment of epicycles and excentrics, and the view that the celestial sp…

Cite this page
Vernet, J., “al-Biṭrūd̲j̲ī”, in: Encyclopaedia of Islam, Second Edition, Edited by: P. Bearman, Th. Bianquis, C.E. Bosworth, E. van Donzel, W.P. Heinrichs. Consulted online on 17 November 2018 <>
First published online: 2012
First print edition: ISBN: 9789004161214, 1960-2007

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