Author: Alison Price   –   Updated: January 2026

💚 Relationships, Love and Romance Astrology

This article is part of my Relationships, Love and Romance series, where I explore compatability, the Part of Marriage, synastry, composite midpoints charts, Davison Relationship charts and wedding elections.

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Inter-Chart Aspects in Synastry

How Planets Connect Across Charts

Cross Chart Aspects

One of the foundational techniques in synastry is examining the aspects that form between two people’s charts. These inter-chart aspects reveal how planetary energies interact, showing where connection, attraction, tension, or understanding naturally occurs.

Bi-wheels

You need to cast a bi-wheel with your birth chart in the inner wheel and your partner’s birth chart in the outer wheel.

Inter-Chart Aspects

Inter-chart (or cross chart) aspects occur when a planet or point in one person’s chart forms a geometric relationship to a planet or point in the other person’s chart.

For example, if your Sun is at 10° Pisces and your partner’s Moon is at 11° Pisces, your Sun and their Moon are conjunctwhich means they are aligned closely in the zodiac and this is regardless of the houses the planets occupy in your respective charts.

At this stage of analysis, the focus is on zodiac longitude, not house positions. We describe it by saying, “your Sun is conjunct their Moon.”

This kind of connection highlights natural resonance between the core energy of your Sun (identity and self-expression) and the emotional, nurturing energy of their Moon.

Why they Matter

Inter-chart aspects show how you influence each other and where you feel naturally drawn. They help answer questions like:

• Where do we feel in sync?
• What qualities in my partner energize or challenge me?
• Where might misunderstandings or tension arise?

What to Consider

Every planet and key point can form aspects across charts this includes the Sun, Moon, Mercury, Venus, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto, Chiron, Eris, and the asteroids if you include them.

Tight Synastry Orbs

Synastry orbs are far tighter than natal orbs. For synastry cross chart aspects use an orb of just 1°.

Inter chart tight aspect orbs are used to determine whether an aspect is active, so that influences are significant and measurable.

Inter-chart aspects are the heartbeat of synastry as they reveal the invisible threads that connect two people and help us understand the dynamics of a relationship beyond simple compatibility.

Main Inter-Chart Aspects in Synastry

Ptolemaic Cross Chart Aspects

Inter-chart aspects describe how planets in one person’s chart interact with planets in another’s. Each aspect has a distinct energy and reveals different ways in which two people can connect, challenge or complement each other.

Conjunction (360/1 = 0°)

Connection, Blending and Intensity

A conjunction occurs when two planets are very close in the zodiac, usually within a few degrees. This is a highly important aspect for any couple.

For example, two people with the same birthday, even in different years, will have their Sun conjoined each other’s Sun.

In synastry, conjunctions indicate strong magnetism and blending of energies.

• The qualities of the two planets merge, often creating immediate recognition or attraction.
• This aspect can feel harmonious or intense, depending on the planets involved.

Conjunctions will be in one house and so will highlight the area of life where you and your partner feel naturally drawn together and can strongly influence each other.

Opposition (360/2 = 180°)

Polarity, Projection and Awareness

Oppositions occur when planets are directly across from each other in the zodiac. This can be a challenge.

In synastry, this aspect indicates strong attraction with tension.

• You may feel pulled toward each other while also noticing differences clearly.
• Oppositions highlight complementary strengths and weaknesses.

This aspect encourages balance and integration, teaching compromise and conscious awareness of contrast.

Trine (360/3 = 120°)

Ease, Flow and Harmony


A trine forms between planets in compatible signs. It represents natural understanding and effortless flow.

• This aspect shows areas where energies complement each other.
• You feel comfortable, supported, and in sync in the areas the planets touch.

Trines are easy and enjoyable, but they may require conscious attention to prevent taking the harmony for granted.

Square (360/4 = 90°)

Challenge, Tension and Growth


Squares occur when planets are in signs that naturally conflict. There is immediate tension between the two people.

In synastry, squares indicate pressure that can spark growth.

• Squares can reveal friction, misunderstandings, or recurring disagreements.
• While challenging, squares often push partners to confront patterns and evolve.

This aspect asks both people to balance differences and learn patience, compromise and awareness.

Sextile (360/6 = 60°)

Opportunity, Latent Talents and Flow


A sextile shows a friendly, supportive connection. The planets are in compatible signs polarity wise, allowing energy to flow easily.

• This aspect brings cooperation and curiosity.
• You may enjoy learning from each other or supporting each other’s growth.

Sextiles are not as magnetic as conjunctions, but they create opportunities for partnership and harmony when both people engage consciously.

Overarch

Aspects Connect People

Inter-chart aspects are the threads that connect two charts. They show where attraction ignites, where challenges appear and where natural support exists.

Understanding these aspects helps you read the relationship as a living, dynamic system rather than just two separate charts.

If there were no significant aspects between the two charts of a couple, it is unlikely that they would even be talking to each other in the first place.

More on Love and Romance

Articles

Here are some more articles about love, romance and relationships.

Compatability

• Sun Sign Compatibility
• Mode Compatibility
• Polarity and Element Compatibility

Points

• The Part of Marriage
• Vindemiatrix

Combination Charts

• Composite Midpoint Charts
• Davison Relationship Charts

Synastry

• Synastry: Partner’s Planets in Your Chart
• Synastry: Planetary Gender
• Synastry: Inter Chart Aspects
• Synastry: Chart Shape

Author Bio

Alison Price: Professional Astrologer

Alison helps you uncover your individual creativity and lead a fulfilling life using your own astrology. She shares her wisdom from the heart with a touch of humor. She offers Consultations for everyone and Coaching for Aspiring Astrologers.

If you’d like to get in touch with Alison, you can reach out to her via email at starzology@gmail.com.

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