#angular_distance__angulardistance  the angular separation between two objects as perceived by an observer; "he recorded angular distances between the stars"
  supertype:  #angle  the space between two lines or planes that intersect; the inclination of one line to another; measured in degrees or radians
  subtype:  #latitude  the angular distance between an imaginary line around a heavenly body parallel to its equator and the equator itself
  subtype:  #declination__celestial_latitude__celestiallatitude__DEC  (astronomy) the angular distance to a point on a celestial object measured north or south from the celestial equator; expressed in degrees; used with right ascension to specify positions on the celestial sphere
  subtype:  #RA__right_ascension__celestial_longitude__celestiallongitude  (astronomy) the angular distance eastward along the celestial equator from the vernal equinox to the intersection of the hour circle that passes through the body; expressed in hours and minutes and second; used with declination to specify positions on the celestial sphere; "one hour of right ascension equals fifteen degrees"
  subtype:  #HA__hour_angle  (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
  subtype:  #true_anomaly  the angular distance of a point in an orbit past the point of periapsis measured in degrees

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