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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 classic literature ?
The instruments provided for the journey consisted of two barometers, two thermometers, two compasses, a sextant, two chronometers, an artificial horizon, and an altazimuth, to throw out the height of distant and inaccessible objects.
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).
This edition has a new chapter on exoplanets; new coverage of the altazimuth coordinate system; revised coverage of planet classification; expanded coverage of the satellites of the planets; and scientific updates related to physics and astronomy, including the discovery of the Higgs boson, indications of water activity on Mars, observations of fragmentation of an asteroid and rings around another one, the meeting of the Rosetta spacecraft with Comet 67P/Churyumov-Gerasimenko, the discovery of new exoplanets, the sunspot cycle, the improved parallax measurements by Gaia and the Hubble Space Telescope, and new properties of the solar wind.
Mounts come in two basic types: altazimuth and equatorial.
77, 1:25 mm eyepiece (40x), eyes 2 : 9mm (111x), seeker: starpointer, mounts: altazimuth motorized tripod: aluminum.
The simple Newtonian reflector optical design, red-dot finderscope, and altazimuth mount on full-height stainless-steel tripod make it easy to navigate the night sky.
5m altazimuth telescope similar to the ESO New Technology Telescope that was proposed for Sutherland before the SALT project came along.
The 30-inch is a permanently mounted altazimuth telescope of 3 tons moving weight, turning on a base ring 10 feet (3m) in dia-meter--the azimuth 'bearing'--itself bedded on a foundation of 7 tons of high-specification reinforced concrete.
The trend among modern telescopes, including the NTT, is to use an altazimuth mount, in which one rotation axis is horizontal, the other vertical.
Ainslie mounted the new mirror in a square mahogany tube, half an inch thick and with an internal diameter of 10 inches (he would have preferred 101/2 inches in hindsight), atop an altazimuth stand that he had previously used for his 61/2-inch (165mm) Calver.
But with the advent of the Dobsonian design and computer-controlled tracking, altazimuth mounts have gained greatly in popularity for strictly visual observing.