What does "six days' punishment" mean? Help me solve it.

Natural punishment: acute infectious disease. In ancient times, people called it a "heavenly punishment" and thought it was a disaster and ghost from heaven.

Mayday is pushed from the old almanac in the order of 60 jiazi, and every 60 days is a round. Among them, the six days of Wuzi, Wuyin, Chen Wu, Wuwu, Wushen and Wuxu are called Wuri, also known as "Liu Wu".

Heaven punishes six days, that is, disasters from heaven always occur in Wuzi, Wuyin, Chen Wu, Wuwu, Wushen and Wuxu.