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Published online by Cambridge University Press: 14 August 2015
Naīr al-Dīn al-Ṭūsī (1201-1274) composed his Tadhkira at Marāgha in 1261 and altered it with his students and produced his “final version” at Baghdad in 1274. The Baghdad version with all its differences from the Marāgha version was published by Ragep [1993]. That the Tadhkira was considered important by astronomers writing in Arabic is amply attested to by the fact that Ragep [1993] can list fourteen commentaries and supercommentaries as well as refer to numerous other derivative texts.