TWO NATAL CHARTS

Synastry Chart

Compare two birth charts: their positions, cross-aspects and placements in each other's houses.

Person A

Birth date

Birth time

Enter the time shown in the birth record. The time zone comes from the location.

City, hospital, or address

London, United Kingdom

Resolving birth time…

Coordinates and time zone

Latitude

Longitude

Time in the birth record

Time zone · from location

City search selects its center. For an exact birth location, choose the hospital on the map.

Person B

Birth date

Birth time

Enter the time shown in the birth record. The time zone comes from the location.

City, hospital, or address

Madrid, Spain

Resolving birth time…

Coordinates and time zone

Latitude

Longitude

Time in the birth record

Time zone · from location

City search selects its center. For an exact birth location, choose the hospital on the map.

Advanced settingsDE442 · Tropical zodiac

Ephemeris model

NASA data used to calculate planetary positions.

Aspect tolerance · degrees

How far from the exact angle an aspect may be. Lower values show fewer aspects.

Research comparison

Optional: calculate with both DE441 and DE442 to check their differences.

Additional points0 selected

Calculation details

Both natal charts use apparent geocentric tropical longitudes at their own birth instants. Each person keeps their own Placidus houses.

Cross-chart aspects are measured between Person A and Person B. House overlays preserve the direction A into B or B into A.

Two people, one zodiac scale

The double wheel keeps each person's planets separate. Select a point or an aspect to inspect its measured geometry.

The prefilled birth details are fictional examples. Replace them with the records you want to compare.