Cast a Human Design composite

Enter both birth records: the tool casts two bodygraphs, overlays their gates into a composite, and lists the electromagnetic channels, shared gates, compromise and dominance and all nine centers.

YOUR INPUT

Enter both sets of details, then cast one synastry chart

What kind of relationship is this?

Set this first: it decides which houses the reading looks at and how the five themes are ordered.

The type never enters the numbers: switching it leaves every aspect and placement identical. Now: No relationship type assumed; read the overall interaction first

What do you most want to see clearly?

Pick the closest one, or write it in your own words. Once the chart is cast, the reading answers it against both charts.

Your question (optional)Optional; guides this reading and never enters the calculation0/240

Synastry casts one natal chart per person, then reads the relationship between them. Order only decides which side is which.

Person A

Name (optional)

Birth details · Person A

Complete every field marked Required before casting.

Calendar

Birth date Required

Birth time Required

Minute precision is enough for gate and line; color is indicative, while tone and base need a birth time to the second

Birthplace Required

Place confirmed · timezone Asia/Shanghai · Longitude 116.4074° · Latitude 39.9075°

Astrology restores the UT instant from the recorded clock time (including historical offsets and DST), then uses latitude and longitude for the Ascendant and houses. Accuracy matters: the Ascendant moves about 1° every 4 minutes.

Person B