Astrolabe - Wikipedia

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• Astrolabe | Definition, History, & Facts - Britannica

• The Story Of The Astrolabe, The Original Smartphone | Innovation

• Astrolabe - History-Computer

• Astrolabe Function & History

• SCIplanet - The Arabs And The Advancement Of Astrolabes

• What Is A Mariner's Astrolabe? - Royal Museums Greenwich

• Ptolemy's Invention Of The Astrolabe Measured Time And The Stars

• Starholder - History Of Science Museum

• Star-Finders Astrolabes - 1001 Inventions

• An Introductory History Of Astrolabes

• Mariner's Astrolabe - Ages Of Exploration

• Astrolabe - Universe Today

• Astrolabe

• How Astrolabes Work - Electronics | HowStuffWorks