gui-hai day pillar

The sixty pairs end here, and the count then returns to 甲子. 癸亥 closes the cycle with yin water on 亥, the Pig, a water branch that holds 壬, Rob Wealth to 癸, and 甲, the Hurting Officer, wood that the water produces. 三命通會 adds a five-day share of 戊, which against 癸 would be a Direct Officer.

百川, the hundred rivers, is the phrase in 三命通會 卷一, one line after the sea of 壬戌. It says these rivers like metal, earth and fire. So the 納音 Water of the Great Sea covers both the ocean and the many streams that the entry names.

Counted backward from 卯, 癸 reaches 亥 at Emperor, 帝旺. Reversing that count is the rule 滴天髓 tells readers to hold loosely, so the placement is a convention of this method.