《宋史·志·卷四》
彗星侵犯，是战争，是丧事；星色赤，是君主失道，又说天子发动战争，王公被废黜。
彗星犯之，为兵，为丧；色赤，为君失道，又曰天子起兵，王公废黜。
If a comet invades, it indicates a war or a funeral; if the color of the star is red, it means that the ruler has lost his way, and some say that the Son of Heaven will launch a war and the princes will be deposed.