《明史·志·卷十三》
求加减差：即盈缩差。以自行度的宫分度数焉引数，代入太阳加减数据表内，照自变量的宫分度数取加减差。
以自行宫度为引数，入太阳加减立成内，照引数宫度取加减差。
To determine the positive and negative difference: Specifically, the expansion and contraction difference. Multiply the degree number for the palace division of the independent degree by the corresponding factor and substitute the result into the solar positive and negative data table to obtain the positive and negative difference according to the palace division degree number of the independent variable.