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Solid Brass Marine Sextant Astrolabe Antique Reproduction Maritime Nautical Ship Celestial Instrument (with Wooden Box) The sextant is a classic nautical tool first used by sailors over 250 years ago to measure the angle of stars above the horizon and calculate global position. … The decorative brass sextant includes an adjustable arc, a 2x scope, an index mirror, sun filters, and a horizon mirror. Our personalized sextant is made up of brass and it comes with good quality of wooden box/or leather case.. Our sextant is not a machine made product. This is a beautifully made reproduction of a 5-inch radius Brass Sextant. Each sextant is expertly crafted from solid brass and marked with a unique serial number. The sextant has an accurately divided Silver scale, and a slow motion control for making small adjustments to the index arm. A powerful magnifier can be swung into position to assist in reading the vernier scale. The telescope has polished glass lenses and produces a sharp magnified image. The mirror mounts are adjustable, and the index mirror has three recessed adjustments. On the back of the sextant is a turned hardwood handle. The sextant measures 5 inches (12.7 cm) tall, 4.25 inches (10.8 cm) wide, 2 5/8 inches (6.7 cm) deep, Sextant is an 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. The device consists of an arc of a circle marked off in degrees, and a movable radial arm pivoted at the center of the circle. A telescope mounted rigidly to the framework, is lined up with the horizon. The radial arm, on which a mirror is mounted, is moved until the star is reflected into a half-silvered mirror in line with the telescope and appears, through the telescope, to coincide with the horizon. The angular distance of the star above the horizon is then read from the graduated arc of the sextant. From this angle and the exact time of day as registered by a chronometer, the latitude can be determined (within a few hundred meters) by means of published tables. These Sextants are a reflecting navigation instrument used to measure the angle between any two visible objects. A Sextant can also be used to measure the lunar distance between the moon another celestial object. People got amazed when they can see this kind of product in this modern era. This brass sextant is truly impressive and unique navy gift for maritime, nautical, hiking, birthdays, anniversaries, and all outdoor enthusiasts.