(4,885 words)

or aṣṭurlāb (Ar.; on the vocalization see also Ibn Ḵh̲allikān, no. 779; idem, Būlāḳ, no. 746), Astrolabe. The word was derived from the Greek ἀστρολάβος or ἀστρολάβον (ὄργανον), name of several astronomical instruments serving various theoretical and practical purposes, such as the demonstration and graphical solution of many problems of spherical astronomy, the measuring of altitudes, the determination of the hour of the day and the night, and the casting of horoscopes. In Arabic the word Asṭurlāb when used alone always means the flat or planispheric astrolabe based on…

Cite this page
Hartner, W., “Asṭurlāb”, in: Encyclopaedia of Islam, Second Edition, Edited by: P. Bearman, Th. Bianquis, C.E. Bosworth, E. van Donzel, W.P. Heinrichs. Consulted online on 18 October 2018 <>
First published online: 2012
First print edition: ISBN: 9789004161214, 1960-2007

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