절월·일진 기준
Five phases strength
The relationship between the solar-month phase and day-stem phase is classified as 旺, 相, 休, 囚 or 死 and used as a supporting influence.
How did it begin?
旺 denotes flourishing, 相 support, 休 rest, 囚 confinement and 死 decline. 旺 and 相 support auspiciousness, 囚 and 死 support inauspiciousness, and 休 is neutral. This does not override principal influences or assess a person’s birth chart.
Calculation rules
Stems map to wood (甲乙), fire (丙丁), earth (戊己), metal (庚辛) and water (壬癸). Spring uses wood, summer fire, autumn metal and winter water; 辰戌丑未 months use earth. Equal phases give 旺, generated by the month 相, generating the month 休, controlling the month 囚 and controlled by the month 死. The month follows solar terms rather than lunar months. For 2020–2050, it changes on the Korean Standard Time calendar date of each jie boundary, applying to the whole date rather than the exact instant. Missing required solar-term data leaves the value unavailable. WhatDay365 uses the device’s local date, changing the day at midnight (00:00). Lunar and day-pillar conversion supports Gregorian dates 1000-02-13 through 2050-12-31; dates outside this range are not estimated.
Source · 欽定協紀辨方書 · 用日法 ↗ (new window)