Planetary geometry
Astrological Aspects
An aspect is a measured angular relationship between two calculated planetary longitudes. It describes how two functions connect: they may combine, exchange resources, create structural friction, reinforce one another or stand across a polarity.
The five major aspect references below explain geometry, mechanism, orb and context. The separate natal examples are interaction pages for one chart; Synastry pages describe contacts between two charts. Similar angles do not make those jobs interchangeable.
Editorial review by Luis PhamMethodology
How aspect evidence works
Angle first
Conjunction is 0°, sextile 60°, square 90°, trine 120° and opposition 180°. The engine measures calculated longitudes; sign names alone do not prove an aspect.
Orb is calculated
Orb is the distance from the exact angle returned by the chart engine. Tighter geometry is closer to exact, but the public reference does not invent one universal allowance for every body or context.
Planets and context matter
The same geometry behaves differently in a natal chart, across two charts in Synastry, or as a timed transit. The planets, signs, houses and the rest of the chart supply the specific mechanism.
Read a calculated aspect in three checks
The aspect name is only the beginning. Use the engine result to separate the geometry from the interpretation.
1. Confirm the angle
Check the two planetary longitudes and the exact aspect returned by the chart engine. Sign combinations alone do not prove a contact.
2. Read the orb
Orb is the distance from the exact angle. It is calculated evidence, not a universal strength score detached from the bodies involved.
3. Add context
The planets, signs, houses and surrounding aspects explain what the connection is doing. A trine is not automatically easy and a square is not automatically bad.
For the same geometry between two people, read Synastry. For a dated moving contact, use transits. Data sources explain the calculation boundary; the editorial review line above links to the full Methodology.
Major aspect references
Read these pages for the geometry and operating mechanism. Follow the natal examples below only when you want a specific within-chart planet-to-planet interaction.
- ConjunctionA conjunction is a 0° relationship in which two planetary functions occupy the same zodiac region. Traditionally that is read as concentration and blending, with the planets involved deciding whether the blend is easy, demanding, or both. Its meaning changes with the two planetary functions and the life areas where their shared signal is calculated.
- OppositionAn opposition is a 180° relationship placing two planetary functions across the zodiac. Read as polarity, it asks for awareness, negotiation, and a way to hold two valid pressures in view. The axis describes distance and contrast; the planets, signs and houses show which two pressures are asking to be held together.
- SquareA square is a 90° relationship that places two planetary functions in friction. Interpreted as pressure, it can expose a problem, demand coordination, and produce genuine skill when it is handled deliberately rather than avoided. The angle names the structural friction; the actual planets and chart context determine what must be coordinated in practice.
- TrineA trine is a 120° relationship that lets two planetary functions move with relative ease. Astrology treats it as a fluent resource that still needs awareness if it is to become deliberate ability. Its ease is a geometric quality, not a promise, and the linked planets and houses show where that resource can be developed.
- SextileA sextile is a 60° relationship that links two planetary functions through an available opportunity. The traditional reading is cooperation that becomes useful only when the chart actively engages it. The opportunity is a geometric opening, while the planets, signs and houses show what kind of participation could make it useful.
Natal aspect examples
These examples answer a narrower question: how two named planetary functions interact inside one natal chart. They do not redefine the aspect geometry or describe a two-person relationship.
- Sun Conjunction MoonA natal Sun conjunction Moon is centered on an exact 0-degree angle, bringing conscious identity and emotional instinct into one concentrated pattern. The actual separation, sign, houses, orb and other natal aspects determine how flexible that unity is. The calculation confirms proximity, while the chart context shows whether the shared signal leaves room for reflection.
- Sun Square SaturnA natal Sun square Saturn is centered on an exact 90-degree angle, placing identity and self-expression in sustained contact with limits, standards and responsibility. The measured separation and full chart show whether that pressure becomes useful structure or excessive self-correction. Calculation establishes the tension; it does not decide whether discipline or inhibition is the better description.
- Moon Square SaturnA natal Moon square Saturn is centered on an exact 90-degree angle, bringing emotional needs into sustained negotiation with boundaries and responsibility. Its measured separation, signs, houses and wider chart decide how care becomes available. The recorded contact describes a coordination problem, not a fixed verdict about emotional capacity or support.
- Venus Conjunction MarsA natal Venus conjunction Mars is centered on an exact 0-degree angle, joining attraction, values and pleasure with desire, pursuit and assertion. The actual separation, signs, houses, orb and other aspects define its boundaries. The close longitude links preference with action, but reciprocity and consent remain questions outside the geometry itself.
- Venus Square MarsA natal Venus square Mars is centered on an exact 90-degree angle, placing attraction and values in active friction with desire and pursuit. The calculated separation, orb, signs, houses and wider chart show how the friction is used. The square identifies competing methods of approach, not proof that intensity means compatibility or mutual interest.
- Venus Square SaturnA natal Venus square Saturn is centered on an exact 90-degree angle, bringing affection and values into sustained contact with boundaries, standards and time. The actual orb and wider chart determine whether restraint protects or constricts expression. The angle supplies a recurring negotiation between warmth and durability, not a prediction about relationship success.
- Mars Square SaturnA natal Mars square Saturn is centered on an exact 90-degree angle, placing initiative and effort in sustained negotiation with limits and timing. The measured separation, verified orb and wider chart show how that pressure becomes pacing, endurance or rigidity. The calculation marks the friction between motion and constraint, while outcomes depend on how the wider chart is used.
- Moon Opposition PlutoA natal Moon opposition Pluto is centered on an exact 180-degree axis, placing emotional security across an axis with deep intensity and transformation. The measured separation, actual orb, signs, houses and wider chart shape how that polarity is held. The opposing longitudes describe a tension to investigate, not evidence of a diagnosis, crisis or inevitable power struggle.
- Venus Trine JupiterA natal Venus trine Jupiter is centered on an exact 120-degree angle, letting affection, pleasure, values and expansion reinforce each other with relative fluency. Its ease is not a guarantee; the measured orb, signs, houses and other aspects show how the flow is used. The fluent geometry can support generosity, but it does not replace proportion, attention or deliberate choice.
Verify the aspects in your chart
Calculate your birth chart to see which contacts are actually present, including the planets, angle, signs, houses and calculated orb.
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