The primary use of a sextant is to measure the angle between an astronomical object and the horizon for the purposes of celestial navigation. In modern usage the term is applied to all modern. Sextant, instrument for determining the angle between the horizon and a celestial body such as the sun, the moon, or a star, used in celestial navigation to determine latitude and longitude. A sextant is a precision optical instrument used primarily in maritime and celestial navigation A sextant’s main use is to measure the angle that separates a celestial body—like the sun, moon, or stars—from the horizon A sextant is a marine navigation instrument used to measure the angle between two objects
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