Ключевые слова: aged, angle, antique, astrolabe, astronomy, brass, brown, calculation, calibration, cartography, celestial, course, cruise, elevation, equipment, exploration, explore, golden, instrument, isolated, latitude, longitude, measure, measurement, mirror, nautical, naval, navigation, navigational, object, old, one, precision, protractor, retro, seafaring, seamanship, sextant, tacheometer, technology, tool, travel, triangle, vintage, voyage, white, yellow,