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 São Tomé and Príncipe Portuguese São Tomé and Príncipe São Tomé and Príncipe islands were a colony of the Portuguese Empire from its discovery in 1470 until 1975, when independence was granted by Portugal. The Portuguese explorers João de Santarém and Pêro Escobar discovered the islands around 1470, which they found uninhabited. The São Tomé island was named by the Portuguese in honor of Saint Thomas, as they discovered the island on his feast day, while the Príncipe island (Prince's island) was named in honor of Afonso, Prince of Portugal, his father's favorite. The first attempt of settlement in the islands began in 1485,