altazimuth /alˈtazɪməθ/

a

I. noun

1. (also altazimuth mount or mounting)
[Astronomy] a telescope mounting that moves in azimuth (about a vertical axis) and in altitude (about a horizontal axis).

Compare with equatorial mount.
2. (also altazimuth telescope) a telescope on an altazimuth mounting.
3. a surveying instrument for measuring vertical and horizontal angles, resembling a theodolite but larger and more precise.
– origin mid 19th cent.: blend of altitude and azimuth.

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