Definition
Azimuth A is the angular distance measured eastward along the horizon from the north point to the vertical circle through the object. Astronomers typically use the north-based convention; some surveying uses south as 0°.
Azimuth
Compass direction of a celestial object measured from north eastward.
3D illustration
Azimuth is the compass direction along the horizon.
Use the menu and time controls to explore. Based on Jean Meeus' Astronomical Algorithms.