Altitude-Azimuth
From SkyInsight
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The earliest types of mounts are today known as altitude-azimuth, or alt-az systems. The name refers to the way the system allows the telescope to be moved in altitude, up and down, or azimuth, side to side, as separate motions. They typically consisted of a two-prong fork with the telescope sitting between the prongs. Alternate alt-az systems used a single large pipe as one axis, typically the az, with the telescope mounted on a second pipe perpendicular to the first.
