What are the dog days?

Dog days are the first, middle and last day.

Three volts is a general term for initial, middle and final volts. The dog days appear between midsummer and hot summer, which is the time when the temperature is the highest and it is humid and sultry all year round.

The word "V" in three volts has two meanings.

First, it means that Yin Qi was forced by Yang Qi to hide underground;

Second, it means the weather is too hot to move. The sleeping time is determined by the combination of solar terms and dry branch dates. The dog days are characterized by high temperature, low pressure, high humidity and low wind speed.