BaZi · Day Master
The Geng day master (庚, gēng)
Geng is Yang Metal: ore, an axe, a blade that has not been polished yet.
Element: Metal · Polarity: Yang · Pinyin: gēng · Read as: ore, an axe, an unpolished blade
As a day master
A Geng day master is read as decisive, direct and unfinished — metal that wants to be used for something. It cuts before it explains, and it does not do well left in the ground.
What classically stands beside it
The classical line brightens Geng with 丁 (Yin Fire, its Direct Officer) and gives it 甲 (Yang Wood, its Indirect Wealth) to work on; uncut ore stays ore.
Where it sits in a chart
The Day Master is whatever stem the day pillar lands on; a chart can carry the same stem in the year, month or hour pillar, and that is then read as another character standing to the Day Master, not as a second day master.
Where this stem comes from
The day is counted in an unbroken sixty-day cycle, so the stem is not chosen — it is the one the cycle lands on. Enter a birth date and the chart prints it.
Questions
How is the day pillar computed?
Days are counted in a cycle of sixty, unbroken since the calendar began, so a given date always falls on the same stem and branch. Only the hour pillar needs the birth hour.
Does a Geng day master mean I am Metal?
It says the day stem is Metal; the chart counts all eight characters. The Day Master is the reference point, not the whole of the reading.
All ten Day Masters
Jia 甲 · Yi 乙 · Bing 丙 · Ding 丁 · Wu 戊 · Ji 己 · Xin 辛 · Ren 壬 · Gui 癸
Cast your chart All ten Day Masters Luck Pillars (大运) — the ten-year blocks of a BaZi chart