SODRE ASTROLABE
al-Hallaniyyah Island (DhofarGovernorate)
Origin: Kingdom of Portugal and the Algarves
Bronze
901–906
AH/1496–1500 CE (Kingdom of Hormuz and Nabahina Kingdom)
This is the oldest known marine astrolabe in the
world. Discovered on 8 May 2014 CE, the astrolabe was one of the 2,800
artifacts excavated by archaeologists from the wreck site of a Portuguese ship
(nau), identified as the Esmeralda, from Vasco da Gama’s second
voyage to India made in 907–9 AH/1502–03 CE. The bronze astrolabe measures 17.5
cm in diameter and features the Portuguese royal coat of arms and the armillary
sphere (esferaarmila), a personal emblem of D. Manuel I, the King of
Portugal, which he adopted when he was the Duke of Beja. The presence of these
two iconic Portuguese emblems indicate this disc was an object of high status.
The astrolabe was used by early seafarers to measure the altitude of the sun
and stars in order to determine geographical latitude. To date, 107 marine
astrolabes, or components thereof, have been discovered in the world.
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