Compatibility

Compare two charts, without the verdict.

Synastry compares positions and aspects between two natal charts. It is an astrological framework for reflection—not scientific proof that a relationship will succeed or fail.

First person

Display label (optional)

Birth date

Birth timeThis birth time is unknown

Use the local time shown on the birth record when possible.

Birth place

Location search is not live yet. Calculations use only the listed locations; no place is assumed.

Second person

Display label (optional)

Birth date

Birth timeThis birth time is unknown

Use the local time shown on the birth record when possible.

Birth place

Location search is not live yet. Calculations use only the listed locations; no place is assumed.

Birth details and labels are used only for this request. They are not saved, logged in analytics, or placed in the URL.

About the calculation

What synastry compares

Cross-chart aspects

Geometric relationships between one person’s chart points and the other’s, with ownership and orb retained.

House overlays

Where each person’s planets fall in the other person’s houses when both birth times are known.

No percentage

Merissa Lux does not reduce these factual relationships to an unsupported compatibility score.