Opposition

Ptolemy established the opposition as one of his five major aspects in Tetrabiblos (c. 150 CE), describing it as the aspect of maximum distance and therefore maximum tension between two planetary forces. Planets in opposition are six signs apart and always in complementary signs — Aries opposes Libra, Taurus opposes Scorpio — that share the same modality but different elements. This structural pairing means the two energies address the same life domain from opposite directions, creating a polarity rather than simply a conflict. William Lilly (Christian Astrology, 1647) treated oppositions in horary as testimony of open confrontation, opposition from another party, or a situation requiring reconciliation between two competing interests. The modern psychological reading, developed by Liz Greene (Relating, 1977), identifies projection as the core mechanism: we tend to live one pole of an opposition and unconsciously assign the other to other people or external circumstances. A person with Sun in Aries opposing Moon in Libra may experience their own need for autonomy as a constant clash with partners who demand compromise — until they integrate both poles consciously. Robert Hand (Horoscope Symbols, 1981) described the opposition as the aspect of relationship and awareness: it forces us to see ourselves through our encounters with others. The traditional orb for an opposition is approximately 8°–10°.