5. Celestial Navigational Instrument :

In the past, it was almost impossible to determine longitude until 1714, when John Harrison, an English clockmaker came up with the marine chronometer. Prior to that, sailors and navigators only manage to determine their latitude with various navigational instrument. Let's take a look at them now.

1. Latitude Hook, Kamal

2. Cross staff & Back staff


4. Astrolabe

5. Nocturnal


6. Sextant


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