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Qu'est-ce (qui) est altazimuth - définition
![A [[heliostat]] at the THÉMIS experimental station in France. The mirror rotates on an alt-azimuth mount. The pointing direction of the mirror is perpendicular to its surface.](https://commons.wikimedia.org/wiki/Special:FilePath/heliostat.jpg?width=200 "A [[heliostat]] at the THÉMIS experimental station in France. The mirror rotates on an alt-azimuth mount. The pointing direction of the mirror is perpendicular to its surface.")
![abbr=on}} telescopes at [[Paranal Observatory]]. The entire building constitutes the altazimuth mount, saving on mass and cost.](https://commons.wikimedia.org/wiki/Special:FilePath/Paranal opendome.jpg?width=200 "abbr=on}} telescopes at [[Paranal Observatory]]. The entire building constitutes the altazimuth mount, saving on mass and cost.")
![A [[refracting telescope]] (with [[finderscope]] and accessories) on a small alt-azimuth mount.](https://commons.wikimedia.org/wiki/Special:FilePath/SmallAltAzMount.jpg?width=200 "A [[refracting telescope]] (with [[finderscope]] and accessories) on a small alt-azimuth mount.")
Wikipédia
The BTA-6 (Russian: Большой Телескоп Альт-азимутальный, romanized: Bolshoi Teleskop Alt-azimutalnyi, lit. 'Large Altazimuth Telescope') is a 6-metre (20 ft) aperture optical telescope at the Special Astrophysical Observatory located in the Zelenchuksky District of Karachay-Cherkessia on the north side of the Caucasus Mountains in southern Russia.
The BTA-6 achieved first light in late 1975, making it the largest telescope in the world until 1990, when it was surpassed by the partially constructed Keck 1. It pioneered the technique, now standard in large astronomical telescopes, of using an altazimuth mount with a computer-controlled derotator.
For a variety of reasons, BTA-6 has never been able to operate near its theoretical limits. Early problems with poorly fabricated mirror glass were addressed in 1978, improving but not eliminating the most serious issue. But due to its location downwind of numerous large mountain peaks, astronomical seeing is rarely good. The telescope also suffers from serious thermal expansion problems due to the large thermal mass of the mirror, and the dome as a whole, which is much larger than necessary. Upgrades have taken place throughout the system's history and are ongoing to this day.
