altazimuth

[ al-taz-uh-muh th ]

/ ælˈtæz ə məθ /

an instrument for determining both the altitude and the azimuth of a heavenly body.

Origin of altazimuth

First recorded in 1855–60; alt(itude) + azimuth

The observations with the altazimuth are rather more complicated than those with the transit circle.

The Royal Observatory Greenwich |E. Walter (Edwared Walter) Maunder
The third day he had a full day's work on the calculations, followed by a night duty with the altazimuth.

The Royal Observatory Greenwich |E. Walter (Edwared Walter) Maunder
The altazimuth can thus determine the altitude and azimuth of objects, hence the name.

The New Gresham Encyclopedia. Vol. 1 Part 1 |Various
This pillar is the support of Airy's altazimuth, and very nearly marks the place where Flamsteed set up his original sextant.

The Royal Observatory Greenwich |E. Walter (Edwared Walter) Maunder

A most important step taken by Airy was the construction of an altazimuth.

The Royal Observatory Greenwich |E. Walter (Edwared Walter) Maunder

altazimuth

/ (ælˈtæzɪməθ) /

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