Four Pillars, read as structure.

The Four Pillars arrange a birth moment into Year, Month, Day, and Hour. Each pillar has a heavenly stem and earthly branch, forming a structural reference for cultural reflection.

The Year Pillar gives a broad outer coordinate. In a modern archive, it is not treated as the whole identity; it is one visible part of the field.

The Month Pillar is especially important because it carries seasonal context. Solar-term boundaries can change the month structure, so boundary dates must be handled carefully.

The Day Pillar contains the Day Master stem, which the archive uses as the reading reference. The Day Master is meaningful, but never complete by itself.

The Hour Pillar adds another visible layer when birth time is known. If time is unknown, XuanYao uses three pillars and does not create a false Hour Pillar.

Near solar-term transitions such as Li Chun, the archive marks the structure as boundary-sensitive. That reduces confidence language and keeps the reading cautious.

The current engine has strict independent checks, but the public verification state remains provisional until every launch criterion is satisfied and documented.

Read the pillars together. Start with the Day Master, then check season, visible elemental presence, available time data, and the practical reading sections.