Synastry Compatibility Calculator

Compatibility analysis becomes more useful when it moves beyond a one-line score. This synastry calculator is built for users who want to compare two birth charts in a structured way, with clear inputs, visual output, and traceable reasoning behind the result.

Instead of hiding everything behind a generic percentage, the page breaks the reading into chart inputs, scoring dimensions, and cross-chart aspects. That makes it more valuable for learners, content creators, and users who want to understand where a relationship pattern is coming from.

Interface Guide

• Partner A and Partner B cards: Enter each person’s name, birth date, birth time, latitude, and longitude. Names are optional and mainly help with labeling.
• Zodiac selector: Switch between tropical and sidereal frameworks to compare how the compatibility structure changes by tradition.
• House system selector: Controls the house logic used in the chart comparison.
• Generate Synastry / Reset: Run the comparison or clear the current scenario.
• Dual natal chart panels: Show each individual’s chart foundation so the user can relate scores back to the underlying structure.
• Overall match area: Combines the headline score, radar chart, and dimension bars for emotional bond, communication, attraction, stability, spiritual resonance, and values.
• Key cross-aspect table: Lists important planetary pairings, aspect type, and contribution score so users can see what is helping or challenging the match.
• Expand-all control: Useful when you need the full aspect list rather than the condensed view.

Best-Fit Use Cases

• Relationship-themed exploration for couples, collaborators, or character pairs.
• Preparing richer chart-comparison material for teaching or publishing.
• Testing how the reading changes under different zodiac and house systems.

Practical Note

This is a learning and entertainment tool, not a substitute for real relationship judgment. Accurate birth time improves chart reliability significantly. If time data is approximate, house-based outputs and some dimension scores should be treated as directional rather than definitive.

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