Astrolabe - definition from Wikipedia 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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