Geometry
Exact angle: 180°. Lúmina working orb: 8°.
Interpretive function
Organizes experience across a polarity and often exposes what is projected onto another person or situation.
Why the planets matter
The aspect describes the relationship between functions; the planets tell us which functions are negotiating. A Venus–Saturn square is therefore not the same problem as a Mercury–Mars square.
Orb policy
Orb practice varies among astrologers. The numbers above are Lúmina v1 reproducibility standards rather than claims of universal agreement.
Polarity and projection
Opposition places two functions across an axis. The chart owner may initially identify with one end and encounter the other through partners, opponents or circumstances. Integration does not mean making both ends identical; it means keeping both functions in the same decision system.
Applying and separating
An applying aspect is moving toward exactness; a separating aspect has already perfected. This distinction can change emphasis and timing, but it does not erase the aspect geometry or the condition of the planets involved.
Natal aspect versus transit
In transit work, an opposition can externalize the issue by making another person or circumstance visibly carry the other end of the polarity. Projection should be tested against evidence before motive is assigned.
Interpretation checklist
- Name both planetary functions.
- Check sign and house condition.
- Measure the actual orb.
- Distinguish natal pattern from temporary transit.
- Confirm the symbolism against observed context.
Three concrete examples
Sun–Moon can externalize a polarity between conscious direction and habitual need; Venus–Mars can polarize attraction and pursuit; Mercury–Jupiter can set local detail against larger doctrine. Integration means keeping both functions inside the decision rather than assigning one to an opponent.
What not to conclude
An aspect is not an event generator. It describes geometry between functions. A natal aspect cannot prove a diagnosis, relationship outcome or future incident, and a transit requires actual natal contact and context before a specific claim is justified.