Why can the same person and four pillars be different?

Generally, the eight characters at midnight are divergent, so when were you born first?

The constellation of the first set that night was born at 2 1-23.

The constellation of the second set was born after 23 o'clock that night, and you were born the next day according to the time.

So 23:00 is a boundary, and you need to determine whether your birth time is before or after 23:00.