astrolabe

n. instrument used for measuring altitudes (Astronomy, Navigation)

The astrolabe is a historical astronomical instrument used by classical astronomers, navigators, and astrologers. Its many uses included locating and predicting the positions of the Sun, Moon, planets and stars; determining local time given local longitude and vice-versa; surveying; and triangulation. In the Islamic world, they are and were used primarily for astronomical studies, though astrology was often involved there as well. Astrologers of the European nations used astrolabes to construct horoscopes.
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Noun
1. an early form of sextant
(hypernym) sextant

(n.)
An instrument for observing or showing the positions of the stars. It is now disused.
  

(n.)
A stereographic projection of the sphere on the plane of a great circle, as the equator, or a meridian; a planisphere.
  

n.
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