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parallactic$525298$ - translation to greek
MEDIEVAL NAME FOR AN ANCIENT ASTRONOMICAL INSTRUMENT
Parallactic instrument
parallactic
adj. παραλλακτικός
parallactic angle
THE ANGLE BETWEEN THE GREAT CIRCLE THROUGH A CELESTIAL OBJECT AND THE ZENITH, AND THE HOUR CIRCLE OF THE OBJECT
παραλλακτική γωνία
Wikipedia
Triquetrum (astronomy)
The triquetrum (derived from the Latin tri- ["three"] and quetrum ["cornered"]) was the medieval name for an ancient astronomical instrument first described by Ptolemy (c. 90–c. 168) in the Almagest (V. 12). Also known as Parallactic Rulers, it was used for determining altitudes of heavenly bodies. Ptolemy calls it a "parallactic instrument" and seems to have used it to determine the zenith distance and parallax of the Moon.
