After Jie: the forward reference switches

This final case crosses Jingzhe itself. The month pillar advances to Xin-Mao, and because the forward reference is always the next Jie ahead of the birth moment, the reference switches from Jingzhe to Qingming. The starting age jumps from days to years.

Read next to the previous case, this is the sharpest illustration in the suite of how sensitive the start calculation is. Three hours of clock time separate the two records, and they produce a near-immediate start and a ten-year start respectively. Same day, same city, same gender.

For readers, this is the case that argues for care with the reference Jie rather than with the birth time alone. Both records have exact times. What separates them is which side of a solar term they landed on, which is a boundary a date-only reading cannot see.

That makes this a useful case to finish on, because it ties the categories together. It is a solar-term case and a Luck Pillar case at once, and it shows that the boundaries discussed earlier in the suite are not separate curiosities. They are the mechanism through which a small difference in a birth record becomes a large difference in the periods a reading is built on.