Zi Wei Dou Shu — the twelve seats

The four transformations follow

《紫微斗數全書》 zǐwēidǒushùquánshū, which gives 壬 rén its 科 kē to 天府 tiānfǔ the reading two modern schools teach, which moves that 科 kē to 左輔 zuǒfǔ

The year of this board begins

at 立春 lìchūn, where the solar year turns at 正月初一 zhēngyuèchūyī, the first day of the lunar year

Two boards on one page cut the year in two places and neither is a mistake. The pillars turn at 立春 lìchūn because that is what an almanac printing four pillars does; this board counts its month and its day on the lunar calendar, so the year that opened at 正月初一 zhēngyuèchūyī is the reckoning coherent with the rest of it. A birth in the weeks between the two lays out two different boards, the stem of the year being what seats the four transformations.

Zi Wei Dou Shu — the twelve-seat chart of a life

The moment and the place