Exact angle
The target geometry: 0°, 60°, 90°, 120°, or 180°.
RELATIONSHIPS INSIDE THE CHART
Aspects show how chart functions interact. Geometry comes first.
An aspect is an angular relationship between two calculated points. Selyune measures the actual separation, applies a documented orb, and records whether the contact is applying, exact, or separating.
HOW AN ASPECT IS DESCRIBED
Three facts establish the contact before meaning is added.
This structure separates a mathematical relationship from the language used to reflect on it.
Orb
The measured distance from that exact target angle.
Phase
Whether the moving relationship is applying or separating.
Bodies involved
The two functions whose relationship is being read.
THE MAJOR ASPECT SET
Five geometries, each with a different kind of relationship.
Selyune currently calculates the five major aspects for natal charts, transits, and synastry. Minor aspects are not silently introduced by the narrative layer.
COMBINATION + CONCENTRATION
Conjunction
Two functions occupy nearly the same longitude. Their expression is fused, intensified, or difficult to separate.
Natal orb: up to 8°. Transit orb: up to 2.5°.OPPORTUNITY + COOPERATION
Sextile
A supportive contact that often describes available coordination, exchange, or a skill that strengthens through use.
Natal orb: up to 5°. Transit orb: up to 1.5°.FRICTION + DEVELOPMENT
Square
Two functions demand action from incompatible directions. The pressure can become a durable source of effort and growth.
Natal orb: up to 7°. Transit orb: up to 2°.FLOW + REINFORCEMENT
Trine
Functions support one another with relative ease. The capacity may feel natural enough to go unnoticed without attention.
Natal orb: up to 7°. Transit orb: up to 2°.POLARITY + INTEGRATION
Opposition
Two functions face each other across the chart, often becoming visible through contrast, projection, or negotiation.
Natal orb: up to 8°. Transit orb: up to 2.5°.DETERMINISTIC RELEVANCE
Transit priority is calculated, not written by AI.
Selyune ranks current contacts using explicit factors so the most relevant evidence reaches the narrative first.
Measure the separation
The shortest angular distance between two longitudes is compared with each supported exact angle.
Apply the correct orb set
Natal, transit, and synastry contacts use separate documented tolerances.
Determine phase and weight
Tightness, moving body, duration proxy, natal luminaries, and angular houses contribute deterministically.
Attach evidence
Every interpreted contact retains its bodies, aspect, orb, phase, and source calculation.
HONEST OMISSIONS
Uncertain input cannot create a certain aspect.
The aspect set responds to the reliability of the source placements, especially the fast-moving Moon and all angle-dependent context.
What the calculation records
- Exact angular separation and orb
- Applying, exact, or separating phase
- Distinct natal, transit, and synastry orb sets
- Deterministic transit importance
What it does not overstate
- Moon aspects when birth time is unknown
- Minor aspects outside the supported set
- An outcome guaranteed by one aspect
- A compatibility verdict from Sun signs alone
SEE THE CONNECTIONS
Calculate the aspects inside your complete birth chart.
Start with real geometry, then read how the pattern works as a whole.