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the gnomonic application of sharaf aldīn alṭūsī’s linear astrolabe
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نویسنده
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nikfahm khubravan sajjad
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منبع
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تاريخ علم - 1398 - دوره : 17 - شماره : 2 - صفحه:7 -73
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چکیده
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The linear astrolabe was invented by sharaf aldīn alṭūsī (fl. c. 1180) and although several arabic monographs on the subject have reached us, none have received sufficient scholarly attention. as a result, one of the most important features of ṭūsī’s invention, the gnomonic application, remains unknown. based on an analysis of all known monographs on the linear astrolabe, this paper will discuss the gnomonic application of the linear astrolabe, which is an alternative to the azimuth lines typical of the plane astrolabe. we will also consider the potential role of ṭūsī’s pupil, kamāl aldīn ibn yūnus (d. 1242), in the improvement of this instrument. finally, after surveying the available manuscript copies of the abovementioned monographs, we present a full edition and translation of one such text and an edition and translation of one chapter, on the gnomonic application, from another text.
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کلیدواژه
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astrolabe ,gnomon ,kamāl al-dīn ibn yūnus ,linear astrolabe ,sundial.-dīn al-ṭastrolabe ,gnomon ,kamāl al-dīn ibn yūnus ,linear astrolabe ,sharaf al-dīn al-ṭūsī ,sundial
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آدرس
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mcgill university, institute of islamic studies, canada
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پست الکترونیکی
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sajjad.nikfahmkhubravan2@mail.mcgill.ca
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The Gnomonic Application of Sharaf alDīn alṬūsī’s Linear Astrolabe
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Authors
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Nikfahm Khubravan Sajjad
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Abstract
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The linear astrolabe was invented by Sharaf alDīn alṬūsī (fl. c. 1180) and although several Arabic monographs on the subject have reached us, none have received sufficient scholarly attention. As a result, one of the most important features of Ṭūsī’s invention, the gnomonic application, remains unknown. Based on an analysis of all known monographs on the linear astrolabe, this paper will discuss the gnomonic application of the linear astrolabe, which is an alternative to the azimuth lines typical of the plane astrolabe. We will also consider the potential role of Ṭūsī’s pupil, Kamāl alDīn ibn Yūnus (d. 1242), in the improvement of this instrument. Finally, after surveying the available manuscript copies of the abovementioned monographs, we present a full edition and translation of one such text and an edition and translation of one chapter, on the gnomonic application, from another text.
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Keywords
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