A major aspect formed when two planets sit exactly 180 degrees apart in the zodiac, on opposite sides of the chart. The opposition is the architecture of awareness: each planet demands what the other resists, and the relationship between them is forced into consciousness. Where a square hides its tension inside one person, an opposition is usually projected outward and met in another. Sun opposite Moon — the full-Moon temperament — is the classical example: identity and need pulling in opposite directions until some kind of balance is negotiated. In transits, oppositions correspond to culminations: things that began at a conjunction now show their fruit, and a choice must be made. In synastry, an opposition between two charts often produces strong attraction shaded by friction, because each partner carries the half the other is missing. Resolution comes through compromise rather than victory.
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The glossary is a quick reference — for long-form articles see the blog, or skim today’s daily horoscope to see this term in motion.