### what is an Astrolabe

what is an Astrolabe?
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An astrolabe is an elaborate inclinometer and can be considered an analog calculator capable of working out several different kinds of problems in astronomy. Historically used by astronomers and navigators 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. It was used in classical antiquity, the Islamic Golden Age, the European Middle Ages and the Age of Discovery for all these purposes.

The astrolabe's importance not only comes from the early development of astronomy but is also effective for determining latitude on land or calm seas. Although it is less reliable on the heaving deck of a ship in rough seas, the mariner's astrolabe was developed to solve that problem.

•  Astrolabe of Jean Fusoris ( Paris ), 1400

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•  Hebrew astrolabe ( Spain ), 1355

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•  By Arsenius, 1569

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•  Planispheric astrolabe, 1553

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•  Astrolabe ( 1067 ) from Al-Andalus

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•  Planispherical astrolabe (Marocco), XVI century

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•  Astrolabe by Georg Hartmann ( Nuremberg ), 1537

 Astrolabe
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