The Tropic of Capricorn Milestone is at 28 kms. north of the city of Antofagasta, on one side of Route 1, near the Cerro Moreno Airport. Its structure is composed by the Arch of Capricorn, 10.4 mts. tall, with a bar that marks the seasons of the year; El Camino del Sol ( Way of the Sun ), 11 mts. long and 2 mts. wide, from south to north and perpendicular to the Tropic of Capricorn; Las Puertas del Sol (Doors of the Sun), 12.4 mts. high and finally, the Circulo del Mundo ( Circle of the World ), which is a circle that surrounds the monument symbolizing the Earth.
In this circle, the Tropic line is located 23.44 degrees away from the diameter, which represents the Equator. The structure measures 12,4 mts. and is coated with copper.