Shihab al-Din Abu al-'Abbas Ahmad Ibn al-Majdi (1359–1447 CE) was an Egyptian mathematician and astronomer. We publish this short article to celebrate the memory of his passing away in Cairo on 27/28 January 1447.
![Ibn al-Majdi's treatise Irshad al-ha'ir ila takhtit fadl al-da'ir (Guide to the Right Path for the Perplexed in Drawing [Lines] of Surplus of Turn')](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgCn-bokzeSkFBZWacdGaJzMaLnqzp8tK3d-0JLGXnXDDYznap4gLyMNKwH35AuxaDwmxcOi0qyBJLNnedtAL0DrQOTl3XmXNWM0oX9ZwhL9hapJrTGxb-mfl0UbZy_9QKhDm2EwZp978I/s1600/ibn_al_majdi_1.jpg "Ibn al-Majdi's treatise Irshad al-ha'ir ila takhtit fadl al-da'ir (Guide to the Right Path for the Perplexed in Drawing [Lines] of Surplus of Turn')") |
| Two pages, showing respectively high quality astronomical drawings and the colophon, from the manuscript of Ibn al-Majdi's treatise Irshad al-ha'ir ila takhtit fadl al-da'ir (Guide to the Right Path for the Perplexed in Drawing [Lines] of Surplus of Turn'). Treatise on drawing horary lines on the sundials in three parts: on horizontal sundials; on vertical sundials; on oblique sundials, copied by 'Ali bin Hasan, Near East, dated 886 H/1481 CE. |
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