Ahmad Al-Halabi

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Ahmad Al-Halabi (d. 1455) is an astronomer from Aleppo. He wrote on instruments, including: Bughyat Al-Tulab fi’l amal bi rub Al-astrulab, which translates as Aims of pupils on operations with the quadrant of astrolabe, which can be located at Leyden (1001/8); Paris (2524/10); Princeton (Yehuda 1168), and the Garrett Collection; the description of the Leyden manuscript accomplished by Ruska and Hartner.

Another treatise of his is titled Nubdha fi’l amal bu jawdal Al-nisba Al-sittiniya, which is a concise exposition of operations with tables with sexagesimal ratio, which is now found at Oxford University (Oxford I 1035/1). A third treatise is on the operations with the sine quadrant titled: Risala fi’l amal bu rub Al-mujayyab, a treatise that can be located at Princeton University (Yehuda 1168, after A1). Al-Halabi also wrote Jadwal irtifa Al-kawakib Al-thabita inda tulu Al-Fajr (table of the fixed stars on the ascension of dawn) which is now at Cairo (Falak 8525/2), and a final work to mention here is his table for the Azimuth for the latitude of Damascus, which is also located in the same Cairo library.