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What Is a Synastry Chart? Birth Chart Compatibility

CEO Khai Intela
After discovering your birth chart, the next exciting step is exploring a synastry chart, also known as zodiac compatibility. Astrologers use synastry charts to compare two or more birth charts and determine astrological compatibility between...

After discovering your birth chart, the next exciting step is exploring a synastry chart, also known as zodiac compatibility. Astrologers use synastry charts to compare two or more birth charts and determine astrological compatibility between individuals. While it may sound simple, the complexity of synastry charts lies in analyzing the zodiac signs, elements, planets, houses, and aspects. Let's delve into the world of natal chart compatibility and understand the fundamentals of synastry.

Understanding Synastry Charts

During a synastry chart reading, astrologers layer two or more charts on top of each other, creating a bi-wheel. The inner ring represents the first person's birth chart, while the outer chart shows where the planets land in the first person's chart. For example, if you have a Cancer rising and a Cancer moon, and your partner has a Cancer sun, their sun in Cancer would land in your first house near your moon. This alignment is considered synastry gold!

Astrologers consider several factors when analyzing synastry and love compatibility between individuals.

Astrology Compatibility in a Synastry Chart

House Placement

The placement of planets and houses in a synastry chart helps determine how each partner makes the other feel and sets the overall "vibe" of the relationship. For instance, if your partner's sun and Mercury are in your ninth house, it indicates a relationship that demands expansion, learning, and traveling together.

Zodiac Signs and Elements

The zodiac sign and element placements play a significant role in compatibility. If you have a lot of water and earth sign placements, you may be more in touch with your emotions and approach new situations cautiously. In contrast, someone with fire and air sign placements may seek spontaneous adventures every day. Finding harmony between these different approaches is essential for compatibility.


Aspects in a birth chart or synastry chart describe the type of interaction between two planets. For example, if your moon is conjunct someone else's sun, there is an instant connection and understanding of each other's sense of self and inner world. However, tense aspects, such as a square between your moon and someone else's sun, may indicate challenges in aligning your inner and outer expressions.


The placement of specific planets in synastry is crucial. For instance, if someone's Saturn sits on top of your moon, it may be more challenging to feel emotionally supported. Conversely, if someone's Jupiter aligns with your moon, you will likely experience emotional support and expansion. Astrologers analyze various planet combinations to understand the strengths and challenges in a partnership.

What Is a Synastry Chart? Birth Chart Compatibility Image: What Is a Synastry Chart? Birth Chart Compatibility

Zodiac Sign Compatibility in a Synastry Chart

In addition to the factors mentioned above, zodiac sign compatibility is an excellent starting point when exploring synastry or love compatibility. Opposites can attract, and it's often beneficial for partners to bring differing perspectives that inspire self-reflection and growth.

As a general rule, fire signs (Aries, Leo, and Sagittarius) and air signs (Gemini, Libra, and Aquarius) tend to match well together. Fire feeds air, and their energies complement each other. Similarly, earth signs (Taurus, Virgo, and Capricorn) and water signs (Cancer, Scorpio, and Pisces) share a natural ease in their interactions. This compatibility can be compared to how houseplants require water to thrive and grow.

Synastry Chart Compatibility Test

Are you wondering if you and your partner are meant to be? Birth chart compatibility provides valuable insights. Here are key aspects to look for:

  • Moon-Venus Aspects: When someone's Venus (love and values) aligns with your moon, there is a shared sense of security and a strong romantic connection.
  • Sun-Venus Aspects: If someone's sun meshes well with your Venus, it indicates a potential for love and commitment. Your values reflect in each other's personalities and sense of self.
  • Sun-Moon Aspects: When the sun and moon connect, there is a soft and supportive aspect. This alignment fosters mutual understanding, where the sun person's expression aligns with the moon person's emotional core.
  • Mercury-Mercury Aspects: Communication is vital in any partnership. A positive Mercury connection ensures smoother problem-solving and a shared approach to various situations.
  • Saturn Aspects: Saturn represents hardship, and when it forms a softer aspect to another person's personal planet, it can indicate commitment. These aspects test the strength of a partnership as couples navigate difficult times together.

Explore Further

While synastry charts can be complex, they offer insights beyond love relationships. You can calculate synastry charts with family members, friends, and even co-workers. So, pull up some charts and explore the aspects that resonate most with you!

Remember, astrology is a tool for self-discovery and gaining a deeper understanding of your relationships. Enjoy the journey of exploring synastry charts and uncovering the mysteries of compatibility.