Synastry is the branch of astrology that compares two natal charts to assess romantic, platonic, business, or family compatibility. By overlaying one person’s planets, signs, houses, and aspects onto the other’s chart (and vice versa), astrologers reveal the dynamics, attractions, challenges, growth potential, and long-term outlook of the relationship.
In 2026, synastry readings remain one of the most requested services on platforms like PsychicBook — especially for couples wondering “Are we soulmates?”, “Will this relationship last?”, “Why do we keep fighting?”, or “Is this person my twin flame or karmic lesson?” This detailed guide (≈2000 words) explains what synastry is, how it works, key aspects & overlays, love indicators, red flags, popular questions, limitations, and why live synastry readings on PsychicBook offer fast, personalized clarity.
What Is Synastry Reading?
Synastry (from Greek “syn” = together + “astron” = star) studies how two birth charts interact. It answers:
- How do you naturally affect each other emotionally, mentally, sexually, and spiritually?
- Where is the chemistry strongest? Where are the friction points?
- What karmic lessons or shared purpose does the relationship carry?
- Is the connection more romantic, friendly, challenging, or destined?
Unlike composite charts (which create a “relationship chart”), synastry focuses on individual-to-individual interaspects — how one person’s Sun lights up the other’s Moon, or how one person’s Mars ignites the other’s Venus.
Synastry does not predict whether a relationship “will work” with certainty. It shows potentials, chemistry, ease vs. effort required, and growth areas. Free will, communication, and maturity always play the biggest role.
Brief History of Synastry
Synastry concepts appear in ancient Hellenistic astrology (2nd century BCE–7th century CE), where astrologers compared charts for marriage prospects and alliances. Medieval and Renaissance astrologers refined techniques for royal marriages and political partnerships.
Modern psychological synastry emerged in the 20th century:
- Reinhold Ebertin (mid-20th century) — developed midpoints and “planetary pictures” for relationships.
- Liz Greene & Howard Sasportas — brought depth psychology into synastry (Jungian archetypes, shadow dynamics).
- Stephen Arroyo, Tracy Marks, Robert Hand — popularized accessible synastry interpretations in the 1980s–90s.
Today, online tools (Astro.com, AstroSeek) generate free synastry grids, but live interpretation with an experienced astrologer remains far more nuanced and accurate.
How Does Synastry Reading Work?
- Both birth data needed — Date, exact time (very important), and place of birth for each person.
- Chart overlay — One chart placed inside the other (bi-wheel).
- Interaspects analyzed — Major aspects (conjunction, sextile, square, trine, opposition) between planets.
- House overlays — Where one person’s planets fall into the other’s houses.
- Composite & Davison charts — Often used as a supplement to see the “relationship entity.”
- Interpretation — Astrologer explains chemistry, challenges, sexual attraction, communication style, longevity indicators, and karmic themes.
On PsychicBook, sessions are live via chat: you provide birth details, ask specific questions, and receive real-time explanations (often with chart visuals sent).
Key Synastry Aspects & Overlays for Love
| Aspect / Overlay | Type | Energy & Interpretation in Romance |
|---|---|---|
| Sun–Moon conjunction/trine/sextile | Harmonious | Deep emotional understanding; feels “like home”; classic soulmate indicator |
| Sun–Moon square/opposition | Challenging | Strong attraction but emotional friction; growth through compromise |
| Venus–Mars conjunction/trine | Sexual/romantic | Powerful chemistry, passion, flirtation; “can’t keep hands off” vibe |
| Venus–Venus / Mars–Mars | Harmony | Similar love language & drive; easy affection & sexual compatibility |
| Saturn aspects to personal planets | Karmic / serious | Long-term potential but lessons in commitment, responsibility |
| Pluto aspects to Venus/Moon | Intense/transformative | Obsessive attraction, power struggles, deep bonding or toxicity |
| North Node conjunct personal planets | Karmic destiny | Feels fated; major life lessons; “meant to meet” energy |
| 7th house overlays | Partnership | One person’s planets in other’s 7th house = strong marriage/partner potential |
| 5th house overlays | Romance & fun | Playful, creative, passionate dating energy |
| 8th house overlays | Intimacy & depth | Sexual magnetism, shared finances, emotional merging (can be obsessive) |
Strong “soulmate” signatures (multiple):
- Sun–Moon, Venus–Mars, North Node contacts
- 7th/5th/8th house overlays
- Jupiter aspects (growth, optimism)
- Neptune aspects (romantic idealism, spiritual bond)
Red-flag aspects (require work):
- Saturn square/opposition personal planets
- Pluto square/opposition Venus/Moon
- Mars square/opposition Moon/Venus
- Heavy Lilith or Chiron contacts (wounding & healing themes)
Popular Questions in Synastry Readings
- Are we compatible long-term?
- Is he/she my soulmate or twin flame?
- Why do we argue so much even though we love each other?
- Will we get married / stay together?
- Is this a karmic relationship?
- How does he/she feel about me deep down?
- What are our biggest challenges and strengths as a couple?
- Should we move in together / get engaged now?
Benefits of Online Synastry Reading in 2026
- Instant & private — Share birth data securely from home.
- Expert choice — Browse best astrologers specializing in synastry, love astrology, karmic connections (4.7+ stars).
- Interactive — Ask follow-ups, clarify aspects, get chart visuals in real time.
- Affordable trial — Free minutes for new users + 50% off first session on PsychicBook.
- No judgment — Discuss sensitive topics (infidelity concerns, ex comparisons) safely.
- Actionable advice — Not just “yes/no compatibility”, but how to work with energies.
Limitations & Realistic Expectations
- Synastry shows potential, not destiny.
- Free will, maturity, communication, therapy, and timing matter more than any aspect.
- Heavy “fated” aspects can feel destined — but still require effort.
- One challenging aspect does not doom a relationship.
- Always combine astrology with real-life observation.
Why Choose PsychicBook for Synastry Readings?
PsychicBook offers:
- Verified astrologers with strong synastry & relationship expertise.
- Live chat format — fast, confidential, perfect for detailed chart comparisons.
- High ratings (4.7–4.9 ★) for empathy, accuracy, and practical relationship advice.
- Generous promo: free minutes + 50% off first session.
- Mobile app for iOS/Android — easy to upload birth info and read on the go.
Whether you’re dating someone new, navigating a long-term partnership, wondering about an ex, or exploring a “what if” connection, a synastry reading can bring powerful clarity and healing.
