Altazimuth mount
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An altazimuth mount or alt-azimuth mount is a simple two-axis mount for supporting and rotating an instrument about two perpendicular axes – one vertical and the other horizontal. Rotation about the v
A Newtonian telescope on a simple Dobsonian mount
A heliostat at the THÉMIS experimental station in France. The mirror rotates on an alt-azimuth mount. The pointing direction of the mirror is perpendicular to its surface.
One of the 8.2 m (320 in) telescopes at Paranal Observatory. The entire building constitutes the altazimuth mount, saving on mass and cost.
A refracting telescope (with finderscope and accessories) on a small alt-azimuth mount.
Equatorial mount
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An equatorial mount is a mount for instruments that compensates for Earth's rotation by having one rotational axis, called polar axis, parallel to the Earth's axis of rotation. This type of mount is u
Altazimuth mount
…design. The primary disadvantage is its inability to follow astronomical objects in the night sky as the Earth spins on its axis. On the other hand, an equatorial mount only needs to be rotated about a single axis, at a constant rate, to follow the rotation of the night sky (diurnal motion). Altazimuth mounts need to…
A large German equatorial mount on the Forststernwarte Jena 50cm Cassegrain reflector telescope.
German equatorial mount
Open fork mount
English mount on the Hooker telescope