Method精度
Precise to a tenth of a second.
A BaZi chart is only as good as its timing. Here is what we compute, and how we checked it.
- < 0.1 s
- Our solar-term error (NASA JPL DE440)
- 55 s
- Largest error found in two widely used open-source libraries
- 1 in 60
- Births with the wrong month pillar in one of them
Solar-term error, 1900–2049
| Source | Average | Worst case |
|---|---|---|
| This calculator (JPL DE440) | < 0.05 s | 0.05 s |
| lunar-javascript | 0.7 s | 2.9 s |
| sxtwl, 1900–1999 | 0.6 s | 3.3 s |
| sxtwl, 2000–2049 | 18.9 s | 54.9 s |
0 / 1,800
At the boundary
Month pillar checked seconds either side of every solar term from 1900 to 2049. One library got 37 wrong within 2 seconds.
0 / 100,000
Full charts
Year, month, day, hour and luck pillars compared with lunar-javascript on random birth times.
From your clock to the Sun
- 01Clock timeAs written on the birth certificate
- 02Time zoneFull history of offsets and daylight saving
- 03Universal timeThe exact instant of birth
- 04LongitudeLocal mean time at your birthplace
- 05Equation of timeUp to ±16 minutes over the year
- 06True solar timeUsed for the day and hour pillars