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Synastry in Astrology — Relationship Comparison Guide

Compare two birth charts to assess relationship compatibility. Learn how planetary aspects and house overlays reveal chemistry, challenges, and long-term potential between two people.

Overview

What Is Synastry?

Synastry is the astrological art of comparing two birth charts. By overlaying one person's planets onto another's chart, astrologers can see how the two individuals interact — where there's harmony, where there's tension, and where growth happens. Synastry focuses on the between — the energy that flows when two people come together.

🔄 Synastry vs Composite
Synastry: Two charts compared. Shows “how you relate to each other.”
Composite: A single merged chart. Shows “what this relationship is.”
🌐 Explore Synastry
225 Aspect Pages: Planet-to-planet aspects by type
120 House Pages: Planet-in-house overlays

Foundation

Key Aspects in Synastry

☌ Conjunction
Intense merging. Planets fuse their energies. Strong attraction or identification.
☍ Opposition
Tension leading to awareness. “Opposites attract” — projection and growth.
□ Square
Challenge requiring growth. Tension that, when worked through, builds strength.
△ Trine
Natural flow. These energies harmonize easily, creating effortless connection.
✶ Sextile
Opportunity. Requires some initiative to activate, but rewarding once engaged.

How To

How to Read Synastry

Start with the personal planets: Sun (identity), Moon (emotions), Venus (love), Mars (passion). Then move to social planets: Mercury (communication), Jupiter (expansion), Saturn (commitment). Look for conjunctions and oppositions first — they're the most impactful. Trines show ease, squares show growth areas. The houses where planets fall reveal which life areas are activated in the relationship.

Directory

Synastry Aspect Directory

225 aspect pairs — every major planet combination × 5 aspect types (conjunction, opposition, square, trine, sextile).

Sun Aspects
Sun–Moon, Sun–Mercury, Sun–Venus, Sun–Mars, Sun–Jupiter, Sun–Saturn, Sun–Uranus, Sun–Neptune, Sun–Pluto (9 pairs × 5 = 45 pages)
🌙 Moon Aspects
Moon–Mercury, Moon–Venus, Moon–Mars, Moon–Jupiter, Moon–Saturn, Moon–Uranus, Moon–Neptune, Moon–Pluto (8 × 5 = 40 pages)
Mercury Aspects
Mercury–Venus, Mercury–Mars, Mercury–Jupiter, Mercury–Saturn, Mercury–Uranus, Mercury–Neptune, Mercury–Pluto (7 × 5 = 35 pages)
Venus Aspects
Venus–Mars, Venus–Jupiter, Venus–Saturn, Venus–Uranus, Venus–Neptune, Venus–Pluto (6 × 5 = 30 pages)
Mars Aspects
Mars–Jupiter, Mars–Saturn, Mars–Uranus, Mars–Neptune, Mars–Pluto (5 × 5 = 25 pages)
Jupiter Aspects
Jupiter–Saturn, Jupiter–Uranus, Jupiter–Neptune, Jupiter–Pluto (4 × 5 = 20 pages)
Saturn Aspects
Saturn–Uranus, Saturn–Neptune, Saturn–Pluto (3 × 5 = 15 pages)
Uranus Aspects
Uranus–Neptune, Uranus–Pluto (2 × 5 = 10 pages)
Neptune·Pluto
Neptune–Pluto (1 × 5 = 5 pages)

Houses

Synastry House Directory

120 house overlay pages — how each planet's energy lands in each house of your partner's chart.

FAQ

Frequently Asked Questions

What is the difference between Synastry and a natal chart?

A natal chart is your birth blueprint. Synastry compares two charts to reveal relationship dynamics between two people.

Do I need both partners' birth times?

Yes, accurate birth times are essential for precise aspect and house calculations in synastry analysis.

Which synastry aspect is strongest for love?

Venus aspects (especially conjunction) to personal planets — Sun-Venus, Moon-Venus, Venus-Mars — are strongest for romantic attraction.

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