《梦溪笔谈·象数一》
我曾经观测天象、测量日影，并用相关的浑仪、浑象去验证，参考这些数据并操作刻漏，这般经历了十几年，才得到了初步的接近于真实的数据，并写成了四卷书，称为《熙宁晷漏》，都没有沿袭前人的足迹。
余占天侯景，以至验于仪象，考数下漏，凡十余年，方粗见真数，成书四卷，谓之《熙宁晷漏》，皆非袭蹈前人之迹。
I observed celestial bodies, measured the length of shadows, and used the渾儀(celestial globe) and the渾象(armillary sphere) to verify my data. With these figures, I tested the water clocks myself. It took me over ten years to reach initial data that approximated the real figures. I wrote this data in four volumes, called “The Xining Sundials and Water Clocks”, without copying from the work of any predecessor.