Risalat al-Azazi fi al-mazawil (al-Azazi's treatise on sundials)

The Bibliotheca Alexandrina book calls this one of the late works in the history of astronomy, written as an accessible guide to the lines of fadl al-da'ir (hour-angle) and the afternoon-prayer arcs; it has an introduction, two chapters and a conclusion, the first section explaining how to derive the azimuths of fadl al-da'ir with the almucantar quadrant. ¹

• It gives a practical method for making the instrument called basita with a needle housing (compass), used according to the book to find the qibla direction of towns. ^{1 2}
• The author says he made a practical test of the line in 1282 AH; the treatise includes tables, among them the circle drawn around an instrument to give correct mihrab directions. ¹
• The Azhar copy (no. 497/71517) was copied by Ali Mayyas al-Shafi'i al-Bayyumi al-Ahmadi in 1302 AH, 19 folios. ¹