《明史·志·卷十三》
分也乘以二十就是秒，秒满了六十就进位为分。将度、分、秒相加就得到要求的数。求小轮心定度：将小轮心的宫分乘以五就是度。如第一宫乘以五，就得到五度。
并之即得。求小轮心定度置小轮心宫度分，其宫以五乘之为度。
Multiplying minutes by twenty equals seconds, and when seconds reach sixty, it moves up one minute. Summing the degrees, minutes, and seconds provides the requested number. Requesting the small wheel heart orbit: multiplying the small wheel heart house divisions by five equals the degree. For example, multiplying the first house division by five equals five degrees.