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The Spherical Case of the Tūsī Couple

Published online by Cambridge University Press:  24 October 2008

George Saliba  and
E. S. Kennedy
George Saliba
Affiliation:
Department of Middle East Languages and Cultures, 604 Kent Hall, Columbia University, New York, NY 10027, USA
E. S. Kennedy
Affiliation:
American University of Beirut, Lebanon
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Abstract

In this article we study the development of the mathematical theorem, now known as the Tūsī Couple, and discuss the difference between its plane and spherical applications.

Dans cet article, nous étudions le développement du théorème mathématique, connu maintenant sous le nom de ‘couple d'al-Tūsī’; et nous discutons la différence entre son application plane et son application sphérique.

Type
Research Article
Information
Arabic Sciences and Philosophy , Volume 1 , Issue 2 , September 1991 , pp. 285 - 291
Copyright
Copyright © Cambridge University Press 1991

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References

1 Ragep, F. Jamil, “The Two Versions of the Tūsī Couple,” in From Deferent to Equant: A Volume of Studies in the History of Science in the Ancient and Medieval Near East in Honor of E.S. Kennedy, Annals of the New York Academy of Sciences, vol. 500 (1987), pp. 329–56.Google Scholar

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3 Described in detail in Saliba, “The Role of the Almagest.”

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5 See, for example, Kennedy, Edward S., “Late Medieval Planetary Theory,” Isis, 57 (1966): 365–378, p. 370,CrossRefGoogle Scholar and Saliba, George, “The Astronomical Tradition of Maragha: A Historical Survey and Prospects for Future Research,” Arabic Sciences and Philosophy: A Historical Journal, 1 (1991): 67–99.CrossRefGoogle Scholar

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