The first day of Dog Day is the third Geng Day after the summer solstice. This day is Chufu (Toufu), which is the first day of Dog Day.

1. Calculation of the time of the ambush:

The time of the ambush is not fixed every year, and the length of the ambush is also different. You need to consult the almanac to calculate it. You can simply use the "Summer Solstice Sangeng" The 4-character formula indicates the date of the fall, that is, counting from the third "G" day after the summer solstice, the first fall is 10 days, the middle fall is 10 or 20 days, and the last fall is 10 days.

The "Stems and Branches Day Method" was popular in ancient my country, using 60 different groups of names composed of 10 heavenly stems and 12 earthly branches to mark days and use them cyclically. Every day with the word "Geng" is called "Geng Day".

2. Introduction to the Dog Days:

The Dog Days appear during the mild heat and extreme heat. They are the hottest, humid and sultry days of the 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 this way: "Fu" means that the weather is too hot and it is better to stay down than to move. But the reason why the dog days of summer are called "dog days" is because there are also many cold factors involved. Sanfu is the hottest three to forty days of the year in the Central Plains. Sanfu is calculated according to the lunar calendar, and it is approximately between mid-to-late July and early August in the solar calendar.

The reasons why it is hot in the dog days of summer and the foods you should eat:

1. The reasons why it is hot in the dog days of summer:

After entering the dog days of summer, the surface humidity becomes larger and is absorbed every day. There is more heat and less heat is emitted. The heat on the surface layer accumulates, so it gets hotter day by day. When it enters the third volt, the accumulated heat on the ground reaches its peak, and the weather is the hottest. In addition, there is a lot of rain in summer, the air humidity is high, and the heat capacity of water is much greater than that of dry air, which is also an important reason for the muggy weather.

2. Foods to eat during the dog days of summer:

During the dog days of summer, you can eat some seasonal vegetables and fruits. The dog days of summer are the hottest period of the year. At this time, the body loses water quickly and needs to replenish a lot of water. Vegetables and fruits contain a lot of water, and seasonal foods can often replenish what the body needs. Some nutrients are more suitable.