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According to the text, the astrolabe was particularly useful for maritime navigation because it allowed sailors to
The astrolabe, an ancient astronomical instrument, was a remarkably versatile tool. Essentially a two-dimensional model of the celestial sphere, it enabled users to measure the altitude of stars and planets above the horizon. This function was critical for astronomers in calculating time and for astrologers in creating horoscopes. For mariners, however, the astrolabe's most vital application was in navigation. By determining the altitude of the North Star or the sun at noon, a sailor could calculate their ship's latitude—its north-south position on Earth. This capability represented a significant advancement over earlier methods that relied on dead reckoning or following coastlines, allowing for safer and more direct open-ocean voyages.