What is the meaning of "washing sheep" in the calendar of Han Dynasty?

12 The zodiac forms six pairs of conflicting relationships, which are called six reds for short.

Six reds are: rat and horse, cow and sheep, tiger and monkey, hair and chicken, dragon and dog, snake and pig; When the relationship between six reds appears, it is called committing six reds, and everything will go wrong. All parties should try to avoid it.

In the calendar, washing sheep is not about all sheep, but about which sheep is related to the drought that day. There are B-line sheep, D-line sheep, self-line sheep, new-tailed sheep and expensive-tailed sheep. For example, if the ugly day rushes to the sheep, if the sky is dry, it means that the ugly day rushes to the sheep, because Jin Xin Yikemu.