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 is where he would make his greatest impact. When King Manuel I of Portugal was enthroned, he showed some reticence towards Afonso, a close friend of his dreaded predecessor and seventeen years his senior. Eight years later, on 6 April 1503, after a long military career and at a mature age, Afonso was sent on his first expedition to India together with his cousin Francisco de Albuquerque. Each commanded three ships, sailing with Duarte Pacheco Pereira and Nicolau Coelho. They engaged in several battles against the forces of the Zamorin of Calicut ("Calecute", Kozhikode) and succeeded in establishing the King