Oldest Known Astrolabe Discovered

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The oldest known astrolabe was discovered in 2014 on a shipwreck off the coast of Oman and is dated between 1495 to 1500. It was a Portuguese ship called the Esmeralda. Astrolabes are used in navigation to measure the inclined position of celestial bodies.
It's Official: Earliest Known Marine Astrolabe Found in Shipwreck
Astrolabe - Wikipedia

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