20 points

the astrolabe and quadrant were two tools that improve seafaring for
european explorers in the 15th century.

what were they used for?

Astrolabe is an ancient historical instrument that was used mostly for measuring angles.

Quadrant is an instrument that we use to measure angles up to 90 degrees.

Explanation:

Astrolabe was used to determinate and predict the position of the Sun, Moon, planets, and stars, to determine the local time, for meteorological calculations, etc.

Quadrant was used to measure the heights of celestial bodies, to calculate the time when a certain body would pass through a vertical, and to calculate longitude, latitude and time of day.

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