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WESTERN ASTROLOGY · RELATIONSHIP CHARTS

Interactive Partner Chart Explorer: Synastry and Composite

Explore two birth charts by clicking the planets and the measured contacts between them. Switch to a derived composite to study the relationship as one symbolic chart.

STAR & SIGIL

Your birth chart awaits

Open Birth Chart

Enter two birth records

The example is ready to explore. Replace both records with the correct dates, recorded clock times when known, and historical UTC offsets. Select “birth hour unknown” when a time is missing; a civil time-zone name alone is not enough for older dates.

Person A
Person B

Calculated here in your browser. No records are saved or sent to a server. Birthplaces are not collected, so houses and local angles are omitted.

Loading the example chart…

Two ways to look at a relationship

Synastry keeps the two natal charts distinct. The inner ring belongs to Person A, and the outer ring to Person B. A contact is listed when one planet in A’s chart lies near a major angle from a planet in B’s chart. If a birth hour is unknown, local noon is an approximation and that person’s Moon is withheld. Select a contact to see the two exact longitudes, the shortest separation, and its orb. Click either planet to read what it represents before deciding how much weight to give the link.

A midpoint composite puts the corresponding Sun positions halfway along the shorter zodiac arc, then does the same for Moon through Pluto. It is a derived chart of the pair rather than a snapshot of the sky. Its aspect list connects two composite positions. If either birth hour is unknown, composite Moon is withheld. If matching natal points are exactly opposite, the two midpoints are equally valid. Both are shown with question marks and excluded from composite aspects.

Neither method produces a compatibility score. The result can prompt better questions about shared habits, agreements, and boundaries, but direct knowledge of the people carries more weight than a chart. Read the measurement and uncertainty guide →