this article examines al-ṭūsī’s and maghribī’s recensions of theodosius’ sphaerica by comparing their features and differences. al-ṭūsī adheresto the original text of sphaerica, however, by adding some postulates and three lemmas, he enriches the mathematical structure of the treatise. al-ṭūsī’s composition style reveals that he intended to prepare a pedagogical textbook, his statements are con...

there are references to aristotle’s view points about meteorology in ?asfizari’s treatise entitled athar-i ulwi that have not been existed in the arabic translation of aristotle’s meteorologica. ibn bitr?k, the arabic translator, did not translate some parts of the book and there are mistakes in his translation. asfizari has also mentioned some points which cannot be found in the original work ...

dar bayan-i ?istikhradj-i djayb-i yik daradja is a persian treatise by an anonymous author. the author’s purpose is to describe and explain a method for the determination of the sine of one degree according to ??sh ch?’s persian commentary on ulugh beg’s z?dj, and ????z?da’s arabic treatise entitled ris?la fi ?istikhradj djayb daradja wahida. kad?zada’s work, extant in several manuscripts, is, ...

having briefly been reviewed the historical process of changing the formulae for determining the times of islamic prayers, two newly found formulae and a new rule for establishing the times of prayers would be discussed. these matters have been exploited from four texts, still preserved as manuscript: (1) siyyid ¾?y? al-d?n sh?shtar?’s ¼ad b?b dar macrifa al-a½??rl?b, (2) b?r?n?’s ’ist?c?b f? c...

abu al-qasim khalaf ibn al-abbas al-zahrawi, also known as albucasis, is one of the greatest physicians and surgeons in islamic world who is best remembered for his medical encyclopedia, al-tasrif li man ajaz an-il-talif (an aid for those who lack the capacity to read big books). al-tasrif li man ajaz an-il-talif(an aid for those who lack the capacity to read big books). al-tasrifwas translated...