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 the position of the Sun and prominent stars with respect to both the horizon and the meridian. It provided them with a plane image of the celestial sphere and the principal circles—namely ...
Cambridge University historian Federica Gigante is an expert on Islamic astrolabes. So naturally she was intrigued when the Fondazione Museo Miniscalchi-Erizzo in Verona, Italy, uploaded an image of ...
The astrolabe, which is a precursor to the sextant, [1] is effective for determining latitude on land or calm seas. Although it is less reliable on the heaving deck of a ship in rough seas, the mariner's astrolabe was developed to solve that problem.
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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. Measurements...
A guide to astrolabes, what they are, how to use them, and the best models available to buy online.
A beginner's guide to the astrolabe - BBC Sky at Night Magazine
Astrolabes are amongst the most sophisticated scientific instruments ever made. Sometimes referred to as an ancient astronomical computer, a “mathematical jewel,” or an analog calculator, the astrolabe is a multi-functional measuring instrument used by astronomers, navigators, and astrologers which enables the user to perform such tasks as telling the time at day or night, surveying ...