《明史·志·卷十三》
求远近度：以本轮行定度的宫分度数为引敷，代入月亮第二加减差数据表内，取远近度分。
求远近度以本轮行定宫度为引敷，入阴第二加减立成内，取远近度分。
Find the distance difference: Use the palace distance of the fixed degree of this wheel trip as the variable, substitute it into the Moon's second positive and negative difference data table and find the distance difference.