Torquetum

The torquetum or turquet is a medieval astronomical instrument for taking and converting 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: αστρολάβον) and the plane astrolabe. In a sense, the torquetum is an analog computer.

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