Astronomy in the medieval Islamic world

alt=Planispheric Astrolabe made of brass, cast, with fretwork rete and surface engraving|thumb|upright=1.2|North African, planispheric astrolabe. Khalili Collections|Khalili Collection. thumb|upright|A modern astrolabe made in 2013, in Tabriz, Iran.

navigation instrument

overview about the Astronomy in the medieval Islamic world

mathematical device in which a small circle rotates inside a larger circle twice the diameter of the smaller circle

thumb|The muvakkithane ("lodge of the muwaqqit") in [[Hagia Sophia, Istanbul]]

angle-measuring device used for astronomical purposes

type of quadrant used by medieval Arabic astronomers