Editing Telescope mount (section)

== Alt-alt (altitude-altitude) mounts ==
[[File:Baker-Nunn camera 001.JPG|thumb|left|200px|A Baker-Nunn satellite-tracking camera on an altitude-altitude-azimuth mount.]]
Alt-alt mounts, or altitude-altitude mounts, are designs similar to horizontal [[Equatorial mount#English or Yoke mount|equatorial yoke mounts]] or [[Gimbal|Cardan suspension gimbal]]s. This mount is an alternative to the altazimuth mount that has the advantage of not having a blind spot near the zenith, and for objects near the [[celestial equator]] the field rotation is minimized.<ref>[http://www.astronomiainumbria.org/pubblicazioni/OTPT001.pdf La montatura alt-alt (The alt-alt mount), article in italian]</ref>  It has the disadvantage of having all the mass, complexity, and engineering problems of its equatorial counterpart, so is only used in specialty applications such as satellite tracking.<ref name="astr.ua.edu"/> These mounts may include a third azimuth axis (an ''altitude-altitude-azimuth mount'') to rotate the entire mount into an orientation that allows smoother tracking.