« Al-Farghānī On the Astrolabe ». Boethius, Band 52, Stuttgart, Franz Steiner Verlag, 2005, viii + 447 p.

Lorch established and translated for the first time into a modern language a work by the well-known astronomer and engineer of the ninth century, Aḥmad al-Farghānī, one title of which is The Complete [Work] on the Northern and Southern Astrolabe with Geometrical and Computational Explanations. Al-Farghānī’s text is the first work known to us by a Muslim author that explains the theory of the astrolabe. It consists of an introduction and seven chapters. In the introduction the author justifies...