A way of arranging a telescope mount so that the telescope can move parallel to the horizon (azimuth) and at right angles to the horizon (altitude).

Very easy to mechanize, it is becoming more popular in combination with computer control systems, which can alter the altitude and azimuth angles to follow the path of a star as it rises and sets.

A telescope mount with one axis parallel to the earth's rotation axis, and the other at right-angles to it.

This enables the telescope, once locked onto a star's position, to track or to follow the star using a motor drive to compensate for the earth's rotation.

Most large telescopes are mounted in this way, but the altazimuth mount, with its simpler construction, is becoming more popular.

An altizimuth mount is a mounting for astronomical telescopes that has separate axes for horizontal and vertical rotation.

Because celestial objects move in arcs across the sky, tracking their motions with an altazimuth mount requires adjustments of both axes.