The torquetum or turquet is a medieval astronomical instrument designed to take and convert measurements made in three sets of coordinates: Horizon, equatorial, and ecliptic. In a sense, the Torquetum is an analog computer. The first torquetum is thought to have been built by Jabir ibn Aflah (Geber) in the 12th century or 13th century, though the ...
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(from the article `protractor`) ...0° to 180°. It is an ancient device that was already in use during the 13th century. At that time, European instrument makers constructed an ...
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