BaZi · Day Master
The Xin day master (辛, xīn)
Xin is Yin Metal: a jewel, a needle, a mirror — metal that has already been worked.
Element: Metal · Polarity: Yin · Pinyin: xīn · Read as: a jewel, a needle, a mirror
As a day master
A Xin day master is read as exacting, sensitive and finished. It is the small edge that decides a detail, and it notices what other people walk past.
What classically stands beside it
The classical line washes Xin with 壬 (Yang Water, its Hurting Officer) and keeps 丁 (Yin Fire) at a measured distance; held too long over a flame, a jewel loses its water.
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 Xin 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 · Geng 庚 · Ren 壬 · Gui 癸
Cast your chart All ten Day Masters Luck Pillars (大运) — the ten-year blocks of a BaZi chart