An aspect is an angular relationship between two chart points. Software can measure their separation exactly. Astrology groups separations near selected angles and assigns those patterns symbolic meanings.
Major aspect families
| Aspect | Exact angle | Common traditional reading |
|---|---|---|
| Conjunction | 0° | Functions combine or compete for the same space |
| Sextile | 60° | An opening that may benefit from participation |
| Square | 90° | Friction, effort, or a need for adjustment |
| Trine | 120° | Ease, reinforcement, or an established flow |
| Opposition | 180° | Polarity, encounter, or a need to balance viewpoints |
The angle is geometry. The phrases in the third column are interpretive conventions, not forces demonstrated to cause events.
What an orb does
Real placements rarely form a listed angle to the last fraction of a degree. An orb is the allowed distance from exactness. If two points are 92° apart and a square is allowed a 4° orb, a system can label them square because the difference from 90° is 2°.
Orb policies vary by aspect, chart point, and school. A reproducible chart should publish its orb rules. A wider orb includes more aspects but can make a chart noisy; a narrower orb prioritizes closer geometry.
Applying and separating
Some systems also distinguish whether an aspect is moving toward exactness (applying) or away from it (separating). That classification requires positions plus motion at the stated time. It should be calculated, not guessed from a static picture.
A useful reading order
- Confirm the two chart points and their exact separation.
- Check the declared aspect and orb settings.
- Read each point’s symbolic role before combining them.
- Turn the conventional meaning into an open question.
For a close Moon–Saturn square, a prompt might ask how familiar needs interact with limits or responsibility. It should not diagnose emotional difficulty or predict a family event.
Misconceptions
- Squares are not automatically bad and trines are not automatically good.
- More aspect lines do not necessarily make a reading more complete.
- The diagram’s line color has no universal meaning.
- A precise angular separation does not prove the interpretation attached to it.
Start with aspect and orb, then compare individual types such as conjunction, square, and trine.
Sources and further reading
The project methodology and the pinned Astronomy Engine JavaScript reference document the position-and-motion calculation layer. They do not establish the aspect names, orb choices, or symbolic meanings above; those remain declared astrological conventions.