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Shipwreck finds 'earliest navigation tool'

In the article, some marine archaeologists say the object is an astrolabe. The astrolabe is an instrument once used by mariners to measure the altitude of the Sun. The one they found was off the coast of Oman and dates back to the 1495-1500. It was from a Portuguese explorer which sank during a storm in the Indian Ocean in 1503. The boat it was found on was the Esmerlada which lead by Portuguese explorer Vasco da Gama, was the first person to sail directly from Europe to India. The astrolabe was a bronze disc with etches around the edge of the disc seperated by five degrees. It was used to measure the height of the sun above the horizon at noon to determine their location so they could find their way on the high seas. The importance of this Astrolabe is it shows the basic foundations of navigation. Without inventions like these we wouldn't be able to have the foundations into creating more intricate navigational tools usch as the GPS, gyro compass, radars, compass' and many more.

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