《宋史·列传·卷二百二十》
尧帝即位，羲氏、和氏设立浑仪，测定历象日月星辰的变化，钦授民时，使百姓知道农时的缓急。
帝尧即位，羲氏、和氏立浑仪，定历象日月星辰，钦授民时，使知缓急。
When Emperor Yao came to the throne, Xi and He established渾儀, measured the changes in the sun, moon, stars and constellations, and respected and taught the people's time, so that the people knew the urgency of farming time.