The primary use of a sextant is to determine the angle between an astronomical object and the horizon for the purposes of celestial navigation. The determination of this angle, the altitude, is known as sighting (or shooting) the object, or taking a sight. The angle, and the time when it was measured,chart can be used to calculate a position line on a nautical or aeronautical chart. Common uses of the sextant include sighting the sun at solar noon or Polaris at night (in the Northern Hemisphere) to determine latitude. Sighting the height of a landmark can give a measure of distance off and, held horizontally; a sextant can measure angles between objects for a position on a . This is a beautiful piece of handcrafted to perfection A must for every nautical enthusiast. Made of solid brass. All parts are movable with calloused filters, telescope, reading magnifier etc. This is a perfect item for your office and home decor collection. Approx Size Length: 4 Inches Width: 3.1 Inches Thickness: 2.3 Inches / 5.9 cm