copied in naskh script; 28 lines to the page

266 folios; 30.8 x 19.2cm

Abu ‘Ali al-Hasan al-Marrakushi’s treatise, compiled circa 680 AH (1281–2 AD) in Cairo, is the most important written source for medieval Islamic astronomical instruments and includes discussions of sundials, armillary spheres, astrolabes and quadrants for determining time from solar altitude. 

F. Maddison & E. Savage-Smith, Science, Tools & Magic, The Nasser D. Khalili Collection of Islamic Art, volume XII, Part One, London 1997, cat.118, pp.190–2, 200. J.M. Rogers, The Arts of Islam. Masterpieces from the Khalili Collection, London 2010, cat.368, p.311.