01
How it differs from the main star
The main star suggests broad direction; the month star adds inner reactions and familiar behavior.
02
Solar-month boundaries
Months change at twelve solar-term entries, not on the first calendar day.
03
Reading both stars
Matching stars can reinforce a style; different stars can create useful flexibility rather than contradiction.
EXAMPLE
Example: when the two stars differ
Different stars can describe different layers: a public style and a familiar, inner response. That is flexibility, not contradiction.
FAQ
Can calendar birth month alone identify the month star?
Not precisely. Solar-term entry dates, plus the main-star group, determine the month star.