hour angle is a noun meaning "the angular distance along the celestial equator from the observer's meridian to the hour circle of a given celestial body". It carries 2 recorded senses.
the angular distance along the celestial equator from the observer's meridian to the hour circle of a given celestial body
(astronomy) the angular distance of a celestial point measured westward along the celestial equator from the zenith crossing; the right ascension for an observer at a particular location and time of day
astronomy
Definitions, synonyms and semantic relations for hour angle come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.