Altair is the brightest star in the Aquila constellation and the twelfth brightest star in the night sky. Together with Deneb and Vega it forms the three vertices of the Summer Triangle. In the 8th and 9th century the Arabs translated the Ptolemaic system, this is why the new names are a combination of Arabic-mythological and Greek terms. The Arabic name Altair is an abbreviation of the original phrase Al-Nasr al-Tair, which means “escape of the eagle” or “the flying eagle”. The part Al-Tair, also A-Tair, has several meanings, for example “the falling one”, “the flying one” or “the escaping one”.