出典:Wikipedia
出典:『Wikipedia』 (2011/04/04 00:14 UTC 版)
The BTA-6 (Большой Телескоп Альт-азимутальный, Bolshoi Teleskop Alt-azimutalnyi, Eng:Large Altazimuth Telescope) is a 6 m aperture optical telescope at the Special Astrophysical Observatory located on the north side of the Caucasus Mountains in southern Russia. The BTA-6 achieved first light in late 1975, using a computer-controlled alt-az configuration, supporting a single piece glass mirror.