What Is Water of the Great Sea (大海水) in BaZi?

What does Water of the Great Sea establish first?

Water of the Great Sea is the Nayin name for a complete 壬戌 or 癸亥 pillar, and its Nayin phase is Water. It may occur in the Year, Month, Day or Hour Pillar (the two-symbol column for the birth hour). The lookup unit is always one stem–branch pair in the same pillar, never a single character or a cross-pillar combination.

This lookup establishes one historical classification. 壬 remains a Water stem and 戌 a Earth branch; 癸 remains a Water stem and 亥 a Water branch. Nayin Water does not overwrite those ordinary Five-Phase facts.

How can you check for Water of the Great Sea?

Read each complete pillar in an already calculated chart. A pillar that is exactly 壬戌 or 癸亥 has the Water of the Great Sea Nayin. One matching character, a zodiac animal or a real-world object is insufficient.

Worked example: how should a 壬戌 Year Pillar be recorded?

Suppose the Year Pillar (the two-symbol column for the birth year) is 壬戌. The table returns Water of the Great Sea. A clear record says: Year 壬戌; stem 壬 is Water, branch 戌 is Earth; Nayin is Water of the Great Sea, classed as Water. This keeps the Nayin field separate from ordinary elemental data.

If 癸 appears only in the Month Pillar (the two-symbol column for the birth month) and 亥 only in the Day Pillar (the two-symbol column for the birth day), they do not form the same-pillar 癸亥 combination and do not create Water of the Great Sea. Complete pairing comes before image interpretation.

Why does the source use the name Water of the Great Sea?

San Ming Tong Hui describes the sea as receiving many streams, then divides the pair into two images. 壬戌 contains the earth quality of Xu and is called the less clear expression, while 癸亥 combines a water stem, water branch, and water Nayin and is treated as the clearer expression. The same passage develops elaborate correspondences with mountains, rivers, wood, fire, metal, and earth. Those are historical image-making rules tied to exact pillar combinations. They should be quoted as source-specific interpretations, not compressed into a universal rule that “more water is always better.” Preserve the source’s distinction between the two Jiazi. Name the exact additional pillar before using a classical correspondence.

What value does Water of the Great Sea offer a modern reader?

Its practical value is precise lookup: 壬戌 and 癸亥 share this Nayin name, which lets you locate the pair’s distinctive source image and conditions. If another pillar enters an older rule, record that full Jiazi, its location and the source before drawing a comparison.

Keep the reading order explicit: verify calendar inputs and the Four Pillars; retain stems, branches and hidden stems; evaluate Month Command and Day-Master structure; only then add Water of the Great Sea as a Nayin layer. One Nayin name does not determine strength, Useful God, personality, work, relationships, wealth, health or event timing.

Continue reading

• Complete table of the thirty Nayin

  Return to the sixty-Jiazi sequence and verify neighboring pairs.

• Compare another Water Nayin: Water Under the Stream

  A shared phase does not make two images or conditions interchangeable.

• Water in ordinary Five-Phase analysis

  Separate Nayin classification from actual chart relations.

References

• Sanming Tonghui, volume 1: sixty-Jiazi Nayin classifications and images
• Clarify editorial method: lookup, tradition and real-world evidence