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1. A mounting for astronomical telescopes that permits pointing adjustments in both altitude and azimuth.
2. A telescope having such a mounting.


(Astronomy) an instrument for measuring the altitude and azimuth of a celestial body by the horizontal and vertical rotation of a telescope
[C19: from alt(itude) + azimuth]


(ælˈtæz ə məθ)

an instrument for determining both the altitude and the azimuth of a heavenly body.
[1855–60; alt (itude) + azimuth]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.altazimuth - an instrument that measures the altitude and azimuth of celestial bodies; used in navigation
measuring device, measuring instrument, measuring system - instrument that shows the extent or amount or quantity or degree of something
References in periodicals archive ?
Software Bisque, the world's foremost manufacturer of equatorial telescope mounts for remote/robotic astronomy, has announced its first foray into building altazimuth mounts (and modifying its storied TheSkyX software to control them).
In the 1917 May Journal Ainslie wrote a useful three page paper (37) entitled: Notes from the Instrument Committee--On the Choice of a Telescope in which he explained the relative advantages and disadvantages of reflectors, refractors, equatorial mounts and altazimuth mounts.
But with the advent of the Dobsonian design and computer-controlled tracking, altazimuth mounts have gained greatly in popularity for strictly visual observing.
While both equatorial and altazimuth mounts will keep a telescope pointed at an object as it moves across the sky, the altazimuth design has severe limitations for astrophotographers.
Superficially, the two have much in common--both are basic 5-inch Newtonian reflectors on altazimuth mounts.
Simple, inexpensive altazimuth mounts that move up and down in altitude and side to side in azimuth are popular on many entry-level refractors.
Until recently, the motorized systems of most equatorial or altazimuth mounts could not adequately track the ISS, but Software Bisque's mounts controlled by TheSkyX are notable exceptions.
Designed especially for portable telescopes, small altazimuth mounts allow the telescope to be properly balanced and thus have more controlled movements compared to just having the telescope attached to a photographic tripod's pan-and-tilt head.
But the real eye opener is that the Cube costs less than many non-motorized altazimuth mounts, and its price includes the tripod
The other great breakthrough in altazimuth mounts was low-tech as opposed to high-tech.
The Megrez 90 is light enough to work well with small altazimuth mounts such as the William Optics Eazy-Touch or the Stellarvue M1.
Basic altazimuth mounts can certainly be used for astronomical observation, but you may be frustrated by the continual need to make simultaneous manual corrections for two axes.