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 working out several …

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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 calculate …

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 certain stars.

May 25, 2022 · An astrolabe is an astronomical instrument used since ancient times. It consists of rotating discs and rulers to show the positions of astronomical objects at any given time throughout …

Nov 25, 2025 · The astrolabe is an ancient analog calculating instrument. Its name, derived from the Greek astrolabos, means “star-taker,” describing its function of measuring the position of celestial …

Mar 25, 2024 · With an astrolabe, astronomers could calculate the position of objects in celestial spheres, the time of day (or night), the time of year, the altitude of any object, different latitudes, 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 astrolabe.”

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

Jul 5, 2012 · Build your own simple astrolabe to determine your latitude, as the ancient sailors did, or use it in conjunction with trigonometry to determine the height of a very tall object!