It serves as a star chart and physical model of the visible half-dome of the sky. Its various functions also make it an elaborate inclinometer and an analog calculation device capable of …

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astrolabe, any of a type of early scientific instrument used for reckoning time and for observational purposes. One widely employed variety, the planispheric astrolabe, enabled astronomers to …

Aug 31, 2023 · The astrolabe is an astronomical instrument used from around the 6th century to measure time and position by determining the altitude of heavenly bodies like the Sun and …

Any instrument used to measure altitudes above the horizon can be called an astrolabe, although there is a major difference between the classic “planispheric astrolabe” and a “mariner’s …

Mar 7, 2025 · An astrolabe is an ancient astronomical instrument used to measure time, track celestial bodies, and aid in navigation. It consists of a circular disk with a rotating star map and …

Aug 30, 2025 · An astrolabe is an ancient astronomical instrument, whose name originates from Greek words meaning “star-taker.” This device allowed observers to model the celestial …

Aug 28, 2025 · astrolabe (plural astrolabes) An astronomical and navigational instrument for gauging the altitude of the Sun and stars. quotations

As Europeans began traveling farther distances across seas and oceans, they created a version of the astrolabe for maritime travel. Thus, the mariners’ astrolabe was born. It became widely …

Rule Astrolabe made by Georg Hartmann in Nuremberg in 1537, showing a one-sided alidade. Photo by Sage Ross.