Online Couple Synastry Compatibility Test

Part 1: Overview

This is a “Couple Synastry Compatibility Test” tool — enter your and your partner’s (or any two people’s) birth date, time, and location to generate both natal charts and compute 7-dimension compatibility scores covering Emotional Bond, Communication, Attraction, Long-term Stability, Spiritual Resonance, Values, and Overall Match.

The page displays two natal charts (blue for Partner A, pink for Partner B), a central radar chart showing dimension scores, and a detailed cross-aspect table below.

Part 2: Core Concepts

What is Synastry?

Synastry is a method in astrology for comparing two natal charts. By analyzing which houses A’s planets fall into in B’s chart, and the angular relationships (aspects) between planets, we can understand the interaction patterns between two people.

The 7 Compatibility Dimensions

• Emotional Bond: Moon and Venus aspects, reflecting emotional resonance and love expression
• Communication: Mercury aspects, reflecting thought exchange fluency
• Attraction: Mars and Venus aspects, reflecting physical chemistry and passion
• Long-term Stability: Saturn aspects, reflecting relationship durability and commitment
• Spiritual Resonance: Uranus, Neptune, Pluto aspects, reflecting soul-level connection
• Values: Jupiter aspects, reflecting alignment in life goals and beliefs
• Overall Match: Weighted composite of all dimensions above

Part 3: How to Use

Step 1: Enter Partner A’s Info

In the left blue card, enter the first partner’s birth date, time (as precise as possible), and coordinates. Name is optional.

Step 2: Enter Partner B’s Info

In the right pink card, enter the second partner’s information.

Step 3: Generate Synastry

Click the gradient button to compute both charts, perform cross-aspect analysis, and display the full result.

Part 4: Reading Results

1. Start with the central radar chart — see which dimensions score high or low at a glance
2. Check the overall match score — a large percentage number
3. Review dimension bars — specific percentage for each area
4. Examine the cross-aspect table — which planet combinations contribute most, and where challenges lie

General reference: Above 70% suggests strong compatibility, 60-70% has harmonies and challenges, 50-60% may need more compromise.

Final Notes

• This is an entertainment and reference tool; compatibility scores are not real romantic advice
• All calculations are browser-local; birth data is never uploaded
• You can switch zodiac system (Tropical / Sidereal) and house system (Placidus / Koch / Whole Sign / Equal House)

Last verified: 2026-06-13 Source: 0xStarcat/CircularNatalHoroscopeJS