- hour angle - the angular distance along the celestial equator from the observer's meridian to the hour circle of a given celestial body
--1 is a kind of distance
- hour angle, HA - (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
--2 is a kind of angular distance
- hour angle, HA - (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