《北史·列传·卷七十七》
比如辰星，平常早晨出现在雨水节气的，应该出现时也不出现；如果平常早晨出现在惊蛰节气的，距太阳十八度外、三十六度内。
即如辰星，平晨见在雨水者，应见即不见；若平晨见在启蛰者，去日十八度外，三十六度内。
Like 辰星 (star), usually appears on the Yu Shui  solar term in the morning, when it should appear, it does not appear; if it usually appears in the Jing Zhe solar term in the morning, it is 18 degrees to the outside of the sun, within 36 degrees.