Huà Jì

化忌 is the fourth change. 忌 means something to steer clear of, and the calculator's label is Obstruction, yet one star takes it every year, so every chart has exactly one. In stem order from 甲 it goes to 太陽, 太陰, 廉貞, 巨門, 天機, 文曲, 天同, 文昌, 武曲 and 貪狼, so two of the ten land outside the main fourteen.

The book's own phrase is 多管之神, a spirit that meddles in too many things. Its answer in 卷一 names difficulty and friction for the Life and Body palaces and the running periods, and it observes that scholars and soldiers feel it differently. It then offers a line of practical temper, 处事只求七分, in handling affairs seek only seven parts in ten. 卷二 assigns the mark to water and equates it with 計都, a name the passage does not explain.

For 庚 the Wikisource text gives 化忌 to 天同, as the calculator's chart does, while a table on Chinese Wikipedia prints the 庚 row of 紫微斗數全書 with 太陰 in that place. Apart from 庚, that table agrees with the Wikisource verse in this column, and so does the calculator's default chart. The calculator's one departure from the verse, for 壬, concerns 化科, and 武曲 is the 壬 entry here in all of them.