Yang Metal (庚) born in Autumn (秋) means the chart-holder’s day pillar — the central axis of any BaZi reading — is set against the seasonal context of Metal dominance. The Autumn season covers the lunar months 申 (Monkey), 酉 (Rooster), 戌 (Dog), anchored by the solar terms Liqiu to Lidong (roughly Aug–early Nov). In Five Phases terms, Metal’s prevailing energy through these months interacts with Yang Metal’s Metal element in a specific dynamic, and that dynamic is what determines what the chart needs to balance — the useful god (用神).
Classical reading: 甲 (Yang Wood) for Metal to act on as primary useful god, with 丁 (Yin Fire) to refine; restraining Water as secondary. The standard practitioner caveat: 秋庚得甲, 大用之器 — ‘autumn Geng meeting Yang Wood becomes a great tool of use’. Avoid: compounding Metal (over-strong), unproductive isolation.
Yang Metal born in Autumn is the sword in its own season at peak strength — needs purpose. The chart-holder has executive capacity but needs an object to act on (Yang Wood as useful god). Without it, the chart-holder turns inward or destructive; with it, becomes a refined tool serving real work.
An honest disclosure. Useful-god analysis at the Day Master × season level is one input into a much larger calculation. The actual useful god for any chart is determined by combining: (1) the chart structure (格局), (2) the Day Master strength rating (旺衰), (3) the prevailing element across all four pillars, (4) the hidden stems in the month branch (月令藏干), and (5) the active 10-year luck phase (大運). What this page describes — Yang Metal in Autumn — is the ‘default’ reading; charts with unusual structures or special configurations override the default. For your actual chart, book a consultation or learn to do the synthesis yourself in the BaZi Bootcamp.