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 the bridge in the evening. After fruitlessly waiting for the Sultan's reaction, they returned to the ships and prepared a junk (offered by Chinese merchants), filling it with men, artillery and sandbags. Commanded by António de Abreu, it sailed upriver at high tide to the bridge. The day after, all had landed. After a fierce fight during which the Sultan appeared with an army of war elephants, the defenders were dispersed and the Sultan fled. Afonso waited for the reaction of the Sultan. Merchants approached, asking for Portuguese protection. They were given banners to mark their premises, a sign that