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Bolshoi Teleskop Azimutalnyi
Nizhny Arkhyz

The first really large optical telescope to incorporate an altazimuth mount (and thus requiring constant computer control to operate), it is located on the slopes of Mount Pastukhov on the northern side of the Caucasus range, between the Black and Caspian Seas. The telescope uses an f/4 primary mirror (giving a 26-meter tube housed in a dome 58 meters high), with instruments located in an expansive prime-focus housing or at one of the Nasmyth foci on either side of the fork mount (one of the spectrographs has a collimator 2 meters across). [Bill Keel:]

Aperture: 6 meters   Latitude: 43 39 N
First light: 1975 Longitude: 41 26 E
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Elevation: 2070 meters