« Al-Samaw'al versus al-Kūhī on the Depression of the Horizon ». Centaurus, 45 (2003), pp. 116-129.

What is Seen of Sky and Sea (edited and translated by Rashed in Arabic Sciences and Philosophy, 11 (2001), pp. 157-204) is one of only very few treatises by the 10th century geometer Abū Sahl al-Kūhī that deals with topics outside of mathematics proper, namely the area of the surface of the sea and the part of an altitude circle that can be seen by an observer at the top of a tower on an island. Al-Kūhī's method is criticized by the 12th century physician Ibn Yaḥyā al-Samaw'al al-Maghribī, wh..