Relationship Astrology — Agent Interpretation Guide
For agents using the astro MCP to perform relationship chart interpretation.
Resource URI: astro://guides/relationship-astrology
Quick Reference: Tool Call Strategy
synastry (basic) → calculate_synastry_chart(p1, p2)
synastry + filters → calculate_synastry_chart(p1, p2, karmic_filter=true)
synastry + Davison → calculate_synastry_chart(p1, p2, include_davison_full=true)
composite chart → calculate_composite_chart(p1, p2)
davison chart → calculate_davison_chart(p1, p2)
relationship timing → get_composite_transit_preview(p1, p2, start, end)
karmic relationship → get_karmic_relationship_summary(p1_id, p2_id)
full relationship read → synastry(karmic_filter=true) + composite + davison + karmic_summary
Overview
Relationship astrology uses four main techniques to analyze the dynamics between two people:
| Technique |
What It Shows |
Tool |
| Synastry |
Interaction patterns — how Person A's planets trigger Person B's planets |
calculate_synastry_chart |
| Composite Chart |
The relationship as its own entity — structure, identity, public face |
calculate_composite_chart |
| Davison Chart |
The relationship's "birth" — inner experience, emotional tone, long-term evolution |
calculate_davison_chart |
| Transit Timing |
When relationship themes are activated |
get_composite_transit_preview, get_davison_transit_preview |
For serious analysis, use all three main techniques plus natal charts. They are complementary layers, not competing methods.
Standard Relationship Reading Workflow
Step 1: Natal Charts (Context)
Call: calculate_natal_chart for each person individually
Understand each person first. What are their core needs, attachment styles, relationship patterns? This provides context for everything that follows. Key questions:
- What does each person need from a relationship? (Moon sign/house, Venus sign/house)
- What are their relationship patterns? (7th house, Venus aspects, Saturn aspects)
- Where might they have karmic baggage? (South Node, Saturn, 12th house)
Step 2: Synastry — Interaction Patterns
Call: calculate_synastry_chart (use karmic_filter=true for karmic focus, significator_filter=true for romantic focus)
Process the summary section:
- Top aspects (summary.top_aspects): The 10-15 tightest interchart aspects — these are the strongest interaction patterns
- Venus-Mars contacts (summary.venus_mars_contacts): Chemistry, sexual attraction, desire dynamics
- Sun-Moon contacts (summary.sun_moon_contacts): Core compatibility, ego-emotion bonding
- Saturn contacts (summary.saturn_contacts): Commitment, karma, heaviness, stability
- Node contacts (summary.node_contacts): Fated connections, growth catalysts
- House overlays: Which of Person A's planets fall in Person B's houses (and vice versa) — shows which life areas are activated
Key Principle: Each person plays the role of their planet in an interchart aspect. If A's Saturn conjuncts B's Sun, A takes on the Saturn role when B expresses Sun qualities.
Step 3: Composite Chart — The Relationship Entity
Call: calculate_composite_chart
The composite chart describes the relationship as its own entity, not either person.
Reading order:
- Composite Ascendant: How the relationship presents itself to the world
- Composite Sun: Relationship identity and purpose
- Composite Moon: Emotional tone, daily rhythms
- Angular planets (conjunct ASC, MC, DSC, IC): Loudest voices in the relationship
- Key aspect patterns: Especially Saturn, Pluto, Neptune
- House emphasis: Which life areas the relationship focuses on
- Chart ruler: How the relationship navigates challenges
- Unaspected planets: Blind spots in the relationship
Orb guidelines for composite: 3° max (tighter than natal). Sub-1° = defining feature.
Step 4: Davison Chart — Inner Experience
Call: calculate_davison_chart (or calculate_synastry_chart with include_davison_full=true)
The Davison chart is a real chart at a real moment in time (unlike the composite which is purely symbolic). This means it can be progressed and directed like a natal chart.
Composite vs Davison:
| | Composite | Davison |
|---|---|---|
| Nature | Symbolic blueprint | Real moment in space/time |
| Shows | Structure, public face | Inner tone, emotional experience |
| Best for | How relationship functions | How it feels and evolves |
| Timing | Transits | Transits + progressions + solar arcs |
Step 5: Karmic Overlay
Call: get_karmic_relationship_summary or calculate_synastry_chart with karmic_filter=true
See the Karmic Astrology guide for full interpretation framework. Key indicators:
- Saturn-Node contacts between charts (karmic contracts)
- Pluto-South Node contacts (intense past-life patterns)
- Composite/Davison chart emphasizing 8th house (shared transformation)
- South Node contacts suggesting familiarity from past lives
- Saturn-heavy composites suggesting serious, destiny-laden relationships
Step 6: Transit Timing
Call: get_composite_transit_preview or get_davison_transit_preview
Shows when relationship themes are activated by transits:
- Saturn transits to composite/Davison angles: Tests and restructuring
- Jupiter transits: Expansion and growth
- Uranus transits: Sudden changes, disruption
- Pluto transits: Deep transformation
- Eclipses hitting composite/Davison angles: Fateful turning points
Step 7: Synthesis
Find repeated themes across synastry + composite + Davison. These recurring patterns are the core narrative of the relationship.
- Identify the core narrative — What story do all three layers tell together?
- Note contradictions — Where do the layers diverge? These are areas of complexity.
- Assess karmic weight — How many karmic indicators are present? (Saturn, Pluto, Nodes)
- Determine relationship type — Romantic, karmic, business, casual, fated?
- Identify growth edges — What are the challenging aspects teaching?
- Check timing — What transits are activating the relationship now or soon?
Synastry Aspect Interpretation Quick Reference
Venus-Mars (Chemistry)
| Aspect |
Meaning |
| Conjunction |
Intense, obvious physical and romantic attraction |
| Trine/Sextile |
Desire and affection flow easily; compatible sexual needs |
| Opposition |
Strong magnetism with push-pull dynamics |
| Square |
Highly stimulating but prone to friction and fights |
Moon-Venus (Emotional Warmth)
- Creates tenderness, caring, feeling emotionally "fed" by partner
- One of the best aspects for domestic comfort and feeling cherished
- Conjunction, trine, sextile = easy flow; hard aspects = needs clash
Sun-Moon (Core Compatibility)
- Deep understanding at ego and emotional levels
- Conjunction/trine/sextile: natural "getting" of each other
- Opposition: complementary but different needs
- Square: intense attraction with emotional friction
Saturn Aspects (Commitment and Karma)
- Conjunctions feel fated, dutiful, sometimes heavy
- Trines/sextiles provide stability and reliability
- Squares/oppositions bring tests, delays, pressure
- Not inherently bad — many long marriages have strong Saturn contacts
Node Contacts (Fated Connections)
- Planets on North Node: destined connection, growth catalyst
- Planets on South Node: "known you forever" past-life feel
- Saturn on North Node: karmic teacher relationship
- Saturn square Nodes: karmic block, timing challenges
House Overlays Interpretation
When Planet A falls in Planet B's house:
- 1st house: Strongly visible, shapes self-image
- 4th house: Emotional significance, feeling "at home"
- 7th house: Partnership significance, embodies relating energy
- 8th house: Intense psychological/sexual bond
- 10th house: Public significance, affects career
- 12th house: Hidden or spiritual connection, can be confusing
Relationship Type Indicators
Romantic / Sexual
- Venus-Mars aspects (synastry + composite)
- 5th and 8th house emphasis
- Moon contacts for emotional bonding
- Saturn contacts for commitment
- Pluto contacts for intensity
Business / Professional
- Mercury contacts for communication
- 6th and 10th house emphasis
- Saturn contacts for structure
- Jupiter contacts for growth
- Uranus contacts for innovation
Family Dynamics
- Moon contacts for emotional patterns
- 4th house emphasis
- Saturn contacts for duty/parental roles
- Node contacts for karmic family patterns
Friendships
- Mercury contacts for intellectual connection
- 11th house emphasis
- Jupiter contacts for shared optimism
- Uranus contacts for unconventional bonds
Common Mistakes
- Reading composite as a natal chart for one person — The composite describes the relationship entity, not either person.
- Treating difficult aspects as relationship doom — Hard aspects create friction that can strengthen the relationship.
- Reading composite in isolation — Always use with synastry + natal charts.
- Ignoring house overlays — They show which life areas are most activated by the relationship.
- Overemphasizing Venus-Mars — Chemistry is important, but Sun-Moon and Saturn contacts determine long-term compatibility.