《明史·志·卷十一》
大凡改动历法必须经过测量检验，也就应当详知其始末，为什么要返回去追改《授时历》，自己湮没自己的辛勤操劳呢？
夫改宪必由测验，即当具详始末，何反追改《授时历》，自没其勤乎？
Any change in the calendar must be based on measurement and verification, so it is necessary to know the beginning and end of the change. Why go back and change the «Shoushi Li» and destroy one’s own hard work?