ji-hai day pillar

己亥 puts yin earth over 亥, the Pig branch, and water is the element earth dams and controls. Inside 亥 this site's table finds 壬, Direct Wealth for 己, and 甲, Direct Officer, the yang wood that checks this yin earth at opposite polarity. 三命通會 also seats 戊 in 亥 for five days of the month, a stem that 淵海子平 and 神峰通考 leave out.

The reading in 三命通會 卷一 is brief: 蒿艾之茅, the thatch-like stalks of mugwort, fond of water and of the spring and summer months. It shares Wood of the Plain with 戊戌, and only the 戊戌 line carries the word withered.

This site's count places 己 at Conception, 胎, on this branch, the point where a fresh round of the cycle has been started and nothing yet shows. That placement rests on two contested choices, that earth moves with fire and that yin stems run in reverse. A different school would seat 己 somewhere else on the wheel.