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Earliest known Mariner's Astrolabe research

Guinness World Records have independently certified an astrolabe excavated from the wreck site of a Portuguese Armada Ship that was part of Vasco da Gama's second voyage to India in 1502-1503 as the oldest in the world, and have separately certified a ship's bell (dated 1498) recovered from the same wreck site also as the oldest in the world.

from All Top News -- ScienceDaily https://www.sciencedaily.com/releases/2019/03/190318084119.htm
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