《明史·志·卷十三》
又以自变量的宫分度数，缄去数据表内同宫的相近度数，与前后相减，余数化成分相乘，用六度来除，数据表每行相差六度。
求留段以其段小轮心，定宫谍为引数，入五星顺退留立成内，於同宫近度，取本星度分，与前后行查减。
Selected the palace degrees of the independent variable, and cancel out the similar degrees for the same palace in the data table; add and subtract before and after, multiply the remainder to convert to minutes, and divide by six degrees; each row in the data table has a difference of six degrees.