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Answer:

Navigational instrument. Navigational instruments refers to the instruments used by nautical navigators and pilots as tools of their trade. The purpose of navigation is to ascertain the present position and to determine the speed, direction etc. to arrive at the port or point of destination.

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jandres511

Answer:

The astrolabe is an instrument commonly used in navigation to help explorers and sailors to know where they were.

Explanation:

Explorers and sailors could find their distance north and south of the equator by measuring the distance of the sun and stars concerning the horizon.

It can also be used to measure celestial events and astronomers usually use them for observational purposes and also to solve many kinds of problems in astronomy.

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