The site of the world's largest radio astronomy dish, 305 m in diameter, opened in 1963 and upgraded in 1974 when the original wire-mesh surface was replaced by solid panels. The observatory is situated 12 km south of Arecibo, Puerto Rico, and is operated by the National Astronomy and Ionosphere Center (NAIC), which has its headquarters at Cornell University, New York State. The dish is suspended in a natural hollow in the ground, and scans a strip of sky overhead as the Earth rotates. Radio sources can be tracked within 20° of the zenith by using movable feeds suspended above the stationary reflector, giving coverage in declination from about 38° north to 1° south. The Arecibo dish is used for atmospheric studies as well as astronomy.
http://www.naic.edu/ Official observatory website.
Subjects: Astronomy and Astrophysics.