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 to Vijayanagara and Hindu princes in return for their assistance. Afonso explained to his armies why the Portuguese wanted to capture Malacca: In February 1511, through a friendly Hindu merchant, Nina Chatu, Afonso received a letter from Rui de Araújo, one of the nineteen Portuguese held at Malacca since 1509. It urged moving forward with the largest possible fleet to demand their release, and gave details of the fortifications. Afonso showed it to Diogo Mendes de Vasconcelos, as an argument to advance in a joint fleet. In April 1511, after fortifying Goa, he gathered a force of about 900 Portuguese,