Huà Kē

化科 is the third change, and like 化忌 it can settle outside the main fourteen. From 甲 through 癸 the column reads 武曲, 紫微, 文昌, 天機, 右弼, 天梁, 太陰, 文曲, a disputed star for 壬, and 太陰. The calculator shows a mark on 文昌, 文曲, 左輔 or 右弼 separately from the main stars in that palace.

科 means the civil service examinations, and the book's image is a star sitting them in heaven. Its answer in 卷一 says that even when harsh stars are present the person is a fine writer, a model for other scholars, and that with 化權 and 化祿 the Life or Body palace reaches the rank of chief minister. 卷二 assigns the mark to water and says it is glad to meet 魁 and 鉞.

Two year stems differ between sources in this column, and the difference is real. For 壬 the verse in 紫微斗數全書 gives 天府, while the calculator's default, which follows common modern practice, gives 左輔, and the book setting switches it back. A table on Chinese Wikipedia likewise lists 左輔 for 壬 under the separately titled 紫微斗數全集, which was not itself read. For 庚 the Wikisource verse gives 太陰, while that table prints the 庚 row of 紫微斗數全書 with 天同 as 化科 instead. Neither can be called the correct one from the texts alone.