I Ching Six Lines
Cast by date and time — Bagua-Najia method method
Simplified Mai Hoa method:
- n = (year % 100) + month + day
- Upper trigram = (n − 1) % 8 · Lower trigram = (n + hour branch − 1) % 8
- Changing line = (n + hour branch) % 6 · if 0, line 6 is changing