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
Portuguese Empire hostilities with Muslims within those regions and threats from the Mamluk sultan. A Portuguese fleet under the command of Tristão da Cunha and Afonso de Albuquerque conquered Socotra at the entrance of the Red Sea in 1506 and Muscat in 1507. Having failed to conquer Ormuz, they instead followed a strategy intended to close off commerce to and from the Indian Ocean. Madagascar was partly explored by Cunha, and Mauritius was discovered by Cunha whilst possibly being accompanied by Albuquerque. After the capture of Socotra, Cunha and Albuquerque operated separately. While Cunha traveled India and Portugal for trading purposes, Albuquerque