Torquetum
Medieval astronomical instrument / From Wikipedia, the free encyclopedia
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The torquetum or turquet is a medieval astronomical instrument designed by persons unknown to take and convert measurements made in three sets of coordinates: horizon, equatorial, and ecliptic. It is characterised by R. P. Lorch as a combination of Ptolemy's astrolabon (Greek: aστpoλaẞov) and the plane astrolabe.[1] In a sense, the torquetum is an analog computer.