The chart is the starting point of every reading — yet many calculators use only standard time and mis-cast anyone born near an hour boundary. The Witch of Myo reflects solar-term month pillars, true-solar-time and equation-of-time correction, and late-night-hour rules for precision.
Beyond the four pillars you get hidden stems, the Ten Gods, the 12 life stages, sinsal, void (gongmang), and your luck-cycle start age and flow. Your birth data stays on your device and is never sent to a server.