《明史·志·卷十三》
求精细运行数：土、木、金、火四星，以前后两段的经度相减，除以相距的日数，就是每日运行的分数。水星以白羊官第一日的经度，又与前一日的经度相减，余数为第一日的运行分数。
水星以白羊宫初日经度，又与前一日经度相减，馀为初日行分。
Find the precise operation number: the four stars of earth, wood, gold, and fire, subtract the longitude in the two segments before and after, divide by the number of days in between, and this is the score for the daily operation. For Mercury, take the degrees of the first day of the White Ram, and subtract from the degrees of the previous day; the remainder is the running score for the first day.