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Mariner's Astrolabe - Ages of Exploration - Mariners' Museum …
Astrolabe - World History Encyclopedia
Astrolabe - History Tools
Astrolabe - Wikipedia
The Story of the Astrolabe, the Original Smartphone
Astrolabe - Universe Today
How Astrolabes Work - HowStuffWorks
Astrolabe | Definition, History, & Facts | Britannica
The Astrolabe: How to Make One and Understanding Its Use
This 1,000-Year-Old Smartphone Just Dialed In - The New York Times