![]() The astrolabe is effective for determining latitude on land or calm seas. It was used in classical antiquity, the Islamic Golden Age, the European Middle Ages and the Age of Discovery for all these purposes. Historically used by astronomers, it is able to measure the altitude above the horizon of a celestial body, day or night it can be used to identify stars or planets, to determine local latitude given local time (and vice versa), to survey, or to triangulate. In its simplest form it is a metal disc with a pattern of wires, cutouts, and perforations that allows a user to calculate astronomical positions precisely. Its various functions also make it an elaborate inclinometer and an analog calculation device capable of working out several kinds of problems in astronomy. It serves as a star chart and physical model of visible heavenly bodies. A modern astrolabe made in Tabriz, Iran in 2013.Īn astrolabe ( Greek: ἀστρολάβος astrolábos, ' star-taker ' Arabic: ٱلأَسْطُرلاب al-Asṭurlāb Persian: ستارهیاب Setāreyāb) is an astronomical instrument dating to ancient times. North African, 9th century AD, Planispheric Astrolabe. For other pages with a similar name, see Astrolabe (disambiguation).
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