English: This two-page manuscript by Ibrahim al-Arabi al-mashhur

bi-Ibrahim al-Halabi (died 1776? [1190 AH]) is about the sine quadrant and parallel circles. The manuscript is from the Bašagić Collection of Islamic Manuscripts in the University Library of Bratislava, Slovakia, which was inscribed on the UNESCO Memory of the World register in 1997. Safvet beg Bašagić (1870-1934) was a Bosnian scholar, poet, journalist, and museum director who assembled a collection of 284 manuscript volumes and 365 print volumes that reflect the development of Islamic civilization from its inception to the early 20th century. The manuscript is item 298 in Jozef Blaškovič, Arabské, turecké a perzské rukopisy Univerzitnej knižnice v Bratislave (Arab, Turkish, and Persian manuscripts in the University Library, Bratislava).

Islamic manuscripts; Memory of the World; Trigonometry