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Two angles fixing a direction from where you stand.
Also known as: Horizon coordinates, Alt-az notation
Azimuth is the compass bearing of an object and altitude its angle above the horizon. Unlike right ascension and declination, both depend on where and when the observer is, so a horizon coordinate is useless without a place and a time attached.
Fix a direction from an observer as a compass bearing and an angle above the horizon.
Contexts: Technical drawing, Maps
Depend on the observer's position and the moment of observation, unlike equatorial coordinates, so both must accompany the figures.
Contexts: Technical drawing, Maps
Are what a telescope mount on an altazimuth base is driven in, which is why such a mount needs continuous computation to track a star.
Contexts: Technical drawing, Maps
Two numerals each followed by a small degree ring, printed as a pair in an observing note.