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A Guide for the Perplexed on the Drawing of the Circle of Projection
The author of this work, Ibn al-Majdī (1366-1447 [767-850 A.H.]), was a renowned mathematician, geometrician, and astronomer. He was linked with the influential Marāgha School through his teacher, Jamāl al-Dīn al-Māridīnī, who in turn had studied with Ibn al-Shātir al-Dimashqī’. As a descendant of a powerful local family with Mamlūk ties, Ibn al-Majdī served as the official astronomer and timekeeper at Al-Azhar. The work is divided into three chapters and a conclusion. Chapter 1 covers the procedure for projecting the circle of projection (fadl al-dā’ir) onto planes that ...
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National Library and Archives of Egypt
The Travelers Guide on Drawing the Circle of Projection
This is a work on timekeeping and the determination of the direction of prayer (qibla), particularly intended for people who travel. The author, Abu al-‛Abbās Shihāb al-Dīn Ahmad b. Zayn al-Dīn Rajab b. Tubayghā al-Atābakī, known as al-Majdī or Ibn al-Majdī (1366-1447 [767-850 A.H.]), was descended from a powerful family with ties to Mamlūk rulers and was a renowned and prominent mathematician, geometrician, and astronomer. He served as the timekeeper of the Al-Azhar Mosque. This work is an abridgment of his other major book, Irshād al-ḥā’ir ilā ...
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National Library and Archives of Egypt