[Four treatises on astrolabes and astronomy].

Four treatises on astrolabes and astronomy, the first and fourth treatise are incomplete; the first treatise skips from chapter 22 to chapter 30 (f. 5-6) and the fourth treatise is missing some amount of the beginning, the first complete section is "taṣtīḥ dāʼirat al-ufuq" (f. 14r). 1 online resource (18 leaves) : paper, illustrations