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
João Afonso de Albuquerque of Badajoz and occupied Ciudad Rodrigo. A few days after the successful occupation of Medina del Campo by the rebels, João Afonso de Albuquerque died suddenly in that city in 1354, most probably poisoned, according to Pero López de Ayala, by a physician, following the orders of King Peter I, who gave him a poisonous potion. After his death, the King's rivals carried his coffin throughout the kingdom and they did not bury him until King Peter I was defeated. His final resting place was the Monastery of Santa María de la Santa Espina in the province of Valladolid where