《晋书·志·第七章》
以各行星的终日数与天度五百八十九分之二十一万五千一百三十相约，所得分母、分子分别为周率、日率。
各以终日与天度相约，为周率、日率。
Divide the number of terminal days of each planet by 215130, divided by 589, and the resulting denominator and numerator are the cycle rate and the day rate respectively.