Ascension Island a staging point by the British military during the Falklands War. Ascension Island hosts one of four ground antennas (others are on Kwajalein Island, Diego Garcia, and Cape Canaveral) that assist in the operation of the Global Positioning System (GPS) navigational system. NASA operates a Meter Class Autonomous Telescope (MCAT) on Ascension Island for tracking orbital debris, which is potentially hazardous to operating spacecraft and astronauts, at a facility called the John Africano NASA/AFRL Orbital Debris Observatory. In 1501, the Portuguese navigator Afonso de Albuquerque sighted the island on Ascension Day (which fell on 21 May that year) and named
Afonso de Albuquerque are generally regarded as among the most vital to building and securing the Portuguese Empire in the Orient, the Middle East, and the spice routes of eastern Oceania. Afonso is generally considered a military genius, and "probably the greatest naval commander of the age" given his successful strategy—he attempted to close all the Indian Ocean naval passages to the Atlantic, Red Sea, Persian Gulf, and to the Pacific, transforming it into a Portuguese "mare clausum" established over the opposition of the Ottoman Empire and its Muslim and Hindu allies. In the expansion of the Portuguese Empire, Afonso initiated a rivalry