Nautical Astrolabio. Nautical astrolabio. Instrument formed by a metal crown with four radios, as a support of the limbo, of which two quadrants are graduated, and a medeclina or alidada to bring the star. The nautical astrolabium was the result of the simplification of the astronomical, since He used exclusively to measure the heights of the sun or stars to deduce the latitude of the place. It was used in navigation from the 15th to 18th century along with the height quadrant and, subsequently, the ballastilla.

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