Celestial Vault - Alchemy: New Capenna
Alchemy: New Capenna · 2022
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About this card
The horizontal coordinate system is a celestial coordinate system that uses the observer's local horizon as the fundamental plane to define two angles of a spherical coordinate system: altitude and azimuth.
Therefore, the horizontal coordinate system is sometimes called the az/el system, the alt/az system, or the alt-azimuth system, among others. In an altazimuth mount of a telescope, the instrument's two axes follow altitude and azimuth.
Summary from Wikipedia (CC BY-SA 4.0).