Angle

Any one of the four cardinal points in a Figure, or map, of the heavens; variously referring to the Zenith, or South Vertical; the Nadir, or North Vertical; and the East and West horizons: the cusps of the Tenth, Fourth, First and Seventh Houses, or the Medium Coeli, Immum Coeli, Oriens (Ascendant) and Occidens (Descendant) of a Solar or, indeed, of any Celestial Figure. Usually identified as the Southern, Northern, Eatern and Western angles. They are the most powerful and important arcs in Astrology. Planets therein become immensely potent for good or ill, according to the nature of the planets and their aspects. The term may refer to the shape and position of the House as placed on the square maps employed by the ancient astrologers. v. Map of the Heavens. Many depose that the Ascendant is the most powerful angle in any Figure, though Ptolemy gives preference to the Midheaven, or Zenith, since the celestial bodies are uniformly more potent in their effects at their meridian altitude than when rising.

DeVore, Nicholas. Encyclopedia of Astrology. New York: Philosophical Library, 1947.