Special Astrophysical Observatory of the Russian Academy of Science 特设天体物理台
(重定向自Special Astrophysical Observatory)
The Special Astrophysical Observatory (Russian:Специальная Астрофизическая Обсерватория), or SAO RAS for short, is an astronomical observatory, set up in 1966 in the USSR, now operated by the Russian Academy of Sciences. Based in the Bolshoi Zelenchuk Valley of the Greater Caucasus near the village of Nizhny Arkhyz, the observatory houses the large BTA-6 and RATAN-600, an optical and radio telescope, respectively. The two instruments are about 20 km (12 mi) apart.