Astro Synastry

Synastry (astrology compatibility) calculation and interpretation — relationship analysis based on two natal charts. Cross-aspects, house overlays, compatibility scores. Requires the astro-natal-chart skill.

Astrology — Synastry (Compatibility)

Dependencies

This skill requires astro-natal-chart — use it to calculate or load natal charts for both partners before running synastry analysis.

Input Parameters

For synastry calculation, data for both partners is needed:

1. Partner 1: birth date, birth time, birth place
2. Partner 2: birth date, birth time, birth place

If natal chart data is already available in memory (USER.md, cached chart files) — use it directly.

Calculation Algorithm

1. Calculate (or load from files) natal charts for both partners — use the astro-natal-chart skill (scripts/natal_chart_swe.py)
2. Calculate cross-aspects between Partner 1 and Partner 2 planets — scripts/synastry.py
3. Determine house overlays (Partner 1 planets in Partner 2 houses)
4. Generate interpretation by life areas

Execution

# Step 1: Calculate natal charts (via astro-natal-chart skill)
python ../astro-natal-chart/scripts/natal_chart_swe.py DD.MM.YYYY HH:MM City1
python ../astro-natal-chart/scripts/natal_chart_swe.py DD.MM.YYYY HH:MM City2

# Step 2: Calculate synastry
python scripts/synastry.py --chart1 chart1.json --chart2 chart2.json

Or run the agent workflow: calculate both natal charts first, then feed them into synastry.py.

Output Format

💕 SYNASTRY — Compatibility Report
👤 [Name 1]: [birth date], [birth place]
👤 [Name 2]: [birth date], [birth place]

═══════════════════════════════════════
📊 OVERALL COMPATIBILITY SCORE: [X]/100
═══════════════════════════════════════

🔥 PASSION & PHYSICAL ATTRACTION
   Score: [X]/10
   [Mars-Venus, Mars-Mars, Venus-Venus, Pluto aspects]

💞 EMOTIONAL COMPATIBILITY
   Score: [X]/10
   [Moon-Moon, Moon-Sun, Venus-Moon aspects]

🗣️ COMMUNICATION & INTELLECT
   Score: [X]/10
   [Mercury-Mercury, Mercury-Sun, Mercury-Moon aspects]

🎯 SHARED GOALS & VALUES
   Score: [X]/10
   [Jupiter-Jupiter, Sun-Sun, MC-MC aspects]

🏠 FAMILY & DOMESTIC LIFE
   Score: [X]/10
   [4th house, Moon, Venus aspects]

⚡ CONFLICT POINTS
   [description of tense aspects: squares, oppositions]

✨ STRENGTHS OF THE PAIR
   [description of harmonious aspects: trines, sextiles, conjunctions]

🔑 KEY SYNASTRY ASPECTS:
   [table of all cross-aspects]

📋 RECOMMENDATIONS:
   [practical advice for low-score areas]

Synastry Aspect Orbs

For synastry, orbs are slightly tighter than in natal charts:

Aspect	Symbol	Orb
Conjunction	☌	±7°
Opposition	☍	±7°
Square	□	±6°
Trine	△	±6°
Sextile	✶	±4°
Semisextile	⚺	±1.5°
Quincunx	⚹	±1.5°
Semisquare	∠	±1.5°

Key Synastry Aspects

Most important (high weight):

• Sun — Sun — core personality compatibility
• Moon — Moon — emotional compatibility
• Sun — Moon (cross) — deep connection, "recognition"
• Venus — Mars (cross) — sexual chemistry, attraction
• ASC — ASC — first impression of each other
• Saturn — Sun/Moon — stability/seriousness of the relationship

Important (medium weight):

• Venus — Venus — love language
• Mars — Mars — energy and conflicts
• Mercury — Mercury — communication
• Jupiter — Sun/Moon — support and growth
• Pluto — Sun/Moon — transformative connection

Additional:

• Uranus — Venus — unexpectedness in love
• Neptune — Venus — romance, idealization
• MC — MC — shared life directions

House Overlays

When Partner 1 planets fall into Partner 2 houses:

• I house — Partner 1 amplifies Partner 2's personality
• II house — influence on finances and values
• V house — romance, children, creativity
• VII house — partnership, marriage (very important!)
• VIII house — transformation, intimacy, shared resources
• X house — influence on career and status

Scoring

Compatibility score formula (0-100):

• Each trine/sextile between personal planets: +3-5 points
• Each conjunction between personal planets: +2-4 points
• Each square: -2-3 points
• Each opposition: -1-2 points (can be positive — complementarity)
• Sun-Moon cross-aspect: +5-8 points (powerful bond)
• Venus-Mars cross-aspect: +5-7 points (sexual chemistry)
• Saturn harmonious to Sun/Moon: +4-6 points (stability)
• Pluto tense: -3-5 points (control, manipulation risk)

Interpretation Guidelines

• Synastry is a self-discovery tool, not a verdict
• Tense aspects don't mean "incompatibility" — they indicate growth zones
• Absence of aspects between planets is also informative — a "neutral" zone
• Never make categorical conclusions like "you are not right for each other"
• Always frame challenging aspects as opportunities for growth
• Consider the whole chart — a few hard aspects can be outweighed by many harmonious ones

Disclaimer

This is an entertainment/educational tool, not a scientific method. Do not make life decisions solely based on astrological readings.

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Changelog

v1.1.0 (2026-05-28)

• Translated to English — full SKILL.md rewrite from Russian to English
• Added dependency — declared astro-natal-chart as a required skill
• Updated metadata — version bumped to 1.1.0, description notes English language and dependency
• Added disclaimer — educational/entertainment use note
• Expanded interpretation guidelines — best practices for responsible readings
• Added changelog section

v1.0.0 (earlier)

• Initial release in Russian
• Synastry calculation and interpretation workflow
• Aspect scoring system
• House overlay analysis