What is saju?

Saju is the Korean Four Pillars method. It writes your birth year, month, day, and hour as four pairs of characters and reads those eight characters.

Four pillars, eight characters

Saju means four pillars. The year, month, day, and hour of birth each get a pillar. Every pillar holds two characters, a heavenly stem on top and an earthly branch below, which makes eight characters in total.

Where the characters come from

There are ten stems and twelve branches. Pairing them in order produces a cycle of sixty combinations, and years, months, days, and hours all take their names from that same cycle.

The year turns at Ipchun

The saju year does not change on January 1 or on Lunar New Year. It changes at Ipchun, the start of spring, around February 4. Someone born in late January belongs to the previous saju year. Crossfate sets the year pillar by Ipchun as well.

The eight characters are material for a reading. A reader looks at which character sits in which pillar and how the characters relate, so two readers can word the same chart a little differently.

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