In 1730 the sextant was invented and navigators rapidly replaced their astrolabes. User-interface elements feature elements like compasses and astrolabes. He also made navigation instruments, including astrolabes and quadrants. Al-'Ijliyah developed and manufactured astrolabes, an astronomical and navigation instrument, during the 10th century. These astrolabes consist of a lacquered, two-sided board with astronomical sightlines. Medieval astrolabes of England and Western Europe depicted Altair and Vega as birds. Mariner's astrolabes were made of brass. Astrolabes are the most advanced instruments of their time. Alidades of this form are found on astrolabes, mariner's astrolabes and similar instruments. Early sea astrolabes were made from sheets of brass. Astrolabes continued in use in the Greek-speaking world throughout the Byzantine period. This name is widely used on medieval astrolabes from Western Europe. There are no known surviving astrolabes based on this treatise. He built four more astrolabes between 1067 and 1086. Thirteen of his astrolabes survive to this day.