What do you mean by dog days?

1 and 39 days refer to the third "nine days" from the winter solstice, that is, 19-27 days from winter to the future. China lunar calendar uses "99" to calculate seasons. The first day of the winter solstice is "19 days", and every 9 days is a "9". The first nine days are called "19", the last nine days are called "29" and so on. "99" 81days later, winter ends and spring enters, and the coldest period of the year is.

The dog days appear in midsummer and summer heat, which is the day with the highest temperature, humidity and sultry weather in a year. The so-called "dog days" refers to the "dog days" of the lunar calendar, which is the hottest period of the year. It can be understood as "squatting" means that the weather is too hot to move. But the dog days are called "dog days" because there are also many cold factors. The dog days are the hottest thirty or forty days in a year in the Central Plains. The dog days are calculated according to the lunar calendar, between the middle and late July and the early August of the solar calendar.

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