《晋书·志·第八章》
以损益率乘以入历日余，再乘以周日日余二千五百二十八，加周日度小分六百二十六，用定积分减之，余下的为后定积分。
以损率乘入历日余，又以周日日余乘之，以周日日度小分并之，以损定积分，余为后定积分。
Multiply the number of points in the remaining fraction after reduction by the gain/loss ratio, then multiply by 2528 (the number of points in the remaining fraction after reduction for Sunday), add 626 (the odd number of degrees for Sunday), and subtract the definite integral; the remainder is the second definite integral.