《明史·志·卷九》
以泛平积差三十八秒四十微，加泛平积十分七二六，得十一分一十一秒，就是定差。
以凡平积差三十八秒四十微，加凡平积一十零分七二六，得一十一分一十一秒，为定差。
Add the azimuthal difference difference of 38:40 to the azimuthal difference of 10:726 to get 11:11, which is the fixed difference.