This Glossary deals mostly with Arabic Terms that have been adopted by Medieval European scholars and given European names as below. The discussion of the history of changes in Arabic terms is included whenever needed.
علم الهيئة/علم هيئة الفلك/علم الفلك
Science of Astronomy
"3elm Al-Hay2a" is the Arabic name used by Avicenna (Ibn Sina) and the other leading Muslim scholars of the medievals. It means "Science of the Appearance of the Celestial Sphere". The modern form of this Arabic name is (Al-Falak الفلك) or the "Science of Celestial Sphere".