The astrolabe arrived in Spain from the East between 1000 and 1500 and served as one of the basic astronomical educational tools. "Rules of the Astrolabe" including information about the accurate date of the solar year, the sun’s position relative to the earth’s seasons and the height of the midday sun above the horizon made it scientifically possible to determine the accurate latitude in 1473.
The Stella Maris represented the most important navigational tool to sailors because it was possible to read the height of the North Star on the scale when holding the astrolabe to the eye and sighting along its diameter.
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