hour angle

• Terme astronomique désignant l'angle mesuré vers l'ouest le long de l'équateur céleste entre le méridien de l'observateur et le cercle horaire d'un astre, permettant de déterminer la position des étoiles et autres objets célestes.

An astronomical term referring to the angular distance measured westward along the celestial equator from the observer's meridian to the hour circle of a celestial body, used to determine the position of stars and other objects in the sky.

1. Astronomical measurementC2formal

   The angular distance of a celestial object measured westward along the celestial equator from the observer's meridian to the hour circle of the object, usually expressed in hours, minutes, and seconds.

   angle horaire

   • The hour angle of the star was calculated to be 3 hours 45 minutes.
   • Navigators use the hour angle to determine their position at sea.
   • The telescope was adjusted based on the hour angle of the target planet.