An opposition is an aspect of 180° between two points—e.g., between two planets—in an astrological chart. An opposition is a major aspect, regarded as challenging and inharmonious. It is sometimes referred to as the aspect of separation. It is difficult, but not as difficult as a square, partially because a 180° angle carries overtones of a polar relationship. By way of contrast to a square, which tends more to signify inner conflicts, an opposition indicates conflicts between internal and external factors. People with a Mars-Saturn opposition, for example, might regularly attract people into their lives whose impulsive, aggressive behavior (Mars) disrupts their sense of security (Saturn).
Gettings, Fred. Dictionary of Astrology. London: Routledge & Kegan Paul, 1985. Hand, Robert. Horoscope Symbols. Rockport, MA: Para Research, 1981.
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