In astronomy and celestial navigation, the hour angle is the dihedral angle between the meridian plane (containing Earth's axis and the zenith) and the hour circle (containing Earth's axis and a given point of interest). It may be given in degrees, time, or rotations depending on the application.
In astronomy and celestial navigation, the hour angle is the dihedral angle between the meridian plane (containing Earth's axis and the zenith) and the hour circle (containing Earth's axis and a given point of interest). It may be given in degrees, time, or rotations depending on the application.
Source: Wikipedia "Hour angle" · CC BY-SA 4.0
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