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Synastry

Compare two birth charts, or see the relationship as a chart of its own: the composite and the Davison.

First person

Your Name (optional)

Pronouns (optional)

However you write them, that's how you'll be spoken to. Nothing in your chart depends on it — the sky never asks who you are. Left blank, readings stay neutral rather than guess.

Date of Birth *

Time of Birth(12:00 placeholder if unknown — not a recorded time)Birth time unknown

If you don't know the birth time, tick “Birth time unknown”. Otherwise 12:00 is taken as the real time, and its houses and angles are counted.

Birth Place *

Birth TimezoneAuto-filled from location

Second person

Your Name (optional)

Pronouns (optional)

However you write them, that's how you'll be spoken to. Nothing in your chart depends on it — the sky never asks who you are. Left blank, readings stay neutral rather than guess.

Date of Birth *

Time of Birth(12:00 placeholder if unknown — not a recorded time)Birth time unknown

If you don't know the birth time, tick “Birth time unknown”. Otherwise 12:00 is taken as the real time, and its houses and angles are counted.

Birth Place *

Birth TimezoneAuto-filled from location

House system (both charts)

One system for the pair, so each person's planets are placed in the other's houses the same way.

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No account needed. Sign in to load saved charts and save pairs. A blank name shows as “Person A” or “Person B”.

Your pair appears here

Enter both people's birth dates and places, then calculate. The two charts appear as a bi-wheel with their contacts and house overlays, and you can switch to the composite or Davison chart of the relationship.