《汉书·志·律历志下》
献公十五年正月甲寅朔旦冬至，《殷历》认为在乙卯，距懿公七十六年。
献公十五年正月甲寅朔旦冬至，《殷历》以为乙卯，距懿公七十六岁。
In the first month of the fifteenth year of Duke Xian, the first day of spring, the winter solstice, the "Yin Calendar" believes that it is in Yimao, which is seventy-six years away from Yigong.