The Four Pillars: Year, Month, Day and Hour

The four pillars come from the year, month, day and hour of birth, each made of one heavenly stem and one earthly branch. Traditionally each pillar corresponds to a stage of life and to particular family ties.

Year Ancestry · Youth

Life Stage: Ancestry and early life, roughly ages 1–16.

Family Ties: Grandparents and earlier ancestors; also the foundation and character of the family you were born into.

Body Area: Traditionally associated with the head and face.

The Year Pillar is sometimes called the “ancestral palace” — it reads the foundation your family gave you and your affinity with earlier generations. It is also the first of the four pillars to unfold across a life.

Month Parents · Early adult

Life Stage: Parents and siblings, roughly ages 17–32.

Family Ties: Parents and siblings — this pillar reads your affinity and dynamics with the generation just above you and your peers within the family.

Body Area: Traditionally associated with the chest, shoulders and throat.

The Month Pillar is called the “governing pillar” — it is the single most important pillar in the chart, since the month branch is what determines whether the Day Master reads as strong or weak.

Day Self · Spouse

Life Stage: Self and spouse, roughly ages 33–48.

Family Ties: The Day Stem represents you, the Day Master, yourself; the Day Branch is traditionally the “spouse palace,” reading the shape of your partner and how the relationship plays out.

Body Area: Traditionally associated with the abdomen, waist and digestive organs.

The Day Pillar is the hub of the whole chart — the Day Stem is the person the chart is about, and every other character is read as a reference point around it. That is why the Day Master’s strength is the starting point for reading the rest of the chart.

Hour Children · Later life

Life Stage: Children and juniors, roughly age 49 onward.

Family Ties: Children and juniors; also what carries forward into the later part of life.

Body Area: Traditionally associated with the legs and lower body.

The Hour Pillar reads affinity with children, and the shape of later life and how a life winds down. It is the last of the four pillars to unfold.

This mapping of life stages, family ties and body areas to each pillar is one common traditional convention — other schools divide the ages differently, and the body correspondences are not a medical framework, only a symbolic one.