The most sensitive pillar in your BaZi chart — checked.

The Hour Pillar is the first thing BaZi apps disagree on — a few minutes move it, and the hour stem follows the day. Compare what each calendar school says about your hour, side by side.

Check my hour pillar

Free comparison · Birth data stays on your device

24-hour dial highlighting the late Zi hour from 23:00 to midnight — **23:40 in New York**Feb 4, 1994 · Worked example 2 hour answers

Compare your hour pillar.

Enter the time on your birth record. Each column shows the hour pillar from one calendar school.

Birth details

Birth date

Year Month Day

Birth time 24-hour clock

Hour Minute

Birth city

Use true solar timeApplies a longitude correction to the fourth method.

Scroll across to see all four methods.

Hour pillar by calendar school
Almanac	Early-Zi	Solar-term instant	True solar

School agreement margin

What changed

Which method might your app use?

One minute. Two hour pillars.

On Feb 4, 1994 in New York, with true solar time off, all four schools agree at each minute shown. The hour pillar changes from one minute to the next.

See all four pillars, not just the hour →