正格八格

Core principle

In the 月令 method, 格局 is taken from the relationship between the 日主 and the 天干 revealed from 月支藏干.

Practical definition: determine which 藏干 from 月支 is revealed, identify its 十神 relationship to 日主, and name the corresponding 格.

This requires two foundations:

1. The 藏干 contained in each 地支.
2. The 十神 relationship between the 日主 and those 藏干.

Classical schools differ on priority when several 藏干 are revealed, so later chapters compare the major approaches.