This treatise by Badr al-Din al-Maridini (born 1423), better known as Sibt al-Maridini, includes an introduction, 20 sections, and a conclusion. The treatise discusses a range of issues in astronomy, surveying, and mathematics. It describes the sine quadrant and parallel circles, and explains how to measure the width of a river, the angle of a star, the depth of a well, or the height of a mountain. Al-Maridini, whose parents were from Damascus, was born, raised, and educated in Cairo late in the Mamluk Dynasty (1250–1517). 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 295 in Jozef Blaškovič, Arabské, turecké a perzské rukopisy Univerzitnej knižnice v Bratislave (Arab, Turkish, and Persian manuscripts in the University Library, Bratislava).