When Columbus crossed the Atlantic, she did not know exactly where he is. He uses an instrument called an astrolabe to determine the latitude is the distance measured from the Equator.
Then it was discovered that replacing Skestan Astrolabe. Another tool is more accurate is Chonometer which used in navigation work. Navigating job is to determine the exact position where we are.
Expert knowledge of stars can tell us where the previous annual bintangitu star in the sky. They always look to the sky and at a point on the earth a navigator can determine exactly where the ship, or aircraft they are. it is very useful to avoid all accidents or to tell where the ship or aircraft is situated.
Source : Kitab Emas (Penemuan-penemuan dari Dulu Sampai Sekarang)
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