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From which day the Dog Days start in 2020: July 16 The first day 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 four-character formula "Summer Solstice San Geng" to express the date of the ambush. That is to say, counting from the third "Geng" day after the summer solstice, the first fall lasts for 10 days, the middle fall lasts for 10 or 20 days, and the last fall lasts for 10 days. In ancient my country, the "stems and branches method" was popular, which used 60 different groups of names composed of 10 heavenly stems and 12 earthly branches to mark days, and used them cyclically. Every day with the word "Geng" is called "Geng Day". The character "Geng" in Geng Day is the seventh character among the 10 Heavenly Stems "A, B, C, Ding, Wu, Ji, Geng, Xin, Ren and Gui". Geng Day repeats every 10 days. Starting from the summer solstice, according to the arrangement of the stems and branches, the third Geng day is the first fall, the fourth Geng day is the middle fall, and the first Geng day after the Beginning of Autumn is the last fall. When there are 4 Geng days between the Summer Solstice and the Beginning of Autumn, the Zhongfu period lasts for 10 days, and when there are 5 Geng days, the period lasts for 20 days. It seems that the sooner or later the Geng Day appears will affect the length of the Dog Day. Therefore, in some years, the Dog Day will last for 30 days, and in other years, the Dog Day will last for 40 days.

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Tips on how to prevent summer heat

1. Taking a warm water bath dissipates heat faster

Many people believe that "showering" with cold water makes people more comfortable and can also have a cooling effect. But in fact, "showering" with cold water when sweating profusely will quickly close the pores in the body, making the body's heat unable to be dissipated and retained in the body, which can easily cause various diseases. The correct approach is to choose a warm bath, because taking a warm bath dissipates heat faster and makes people feel refreshed after bathing.

2. It is not advisable to drink too much after you are thirsty

Drink water in time in summer, do not wait until you are thirsty before drinking water. The scientific approach is to drink a glass of cold water (about 200 ml) every morning when you wake up, 2-3 cups in the morning, 3-4 cups in the afternoon, and another cup before going to bed at night. The elderly should wake up in the middle of the night to go to the toilet. Finally, drink some water. It is best to drink water in batches, drink slowly and do not drink too much. After sweating a lot from labor and exercise, it is not advisable to drink a lot of plain water. You should add some light salt (sugar) water appropriately, because after a lot of sweating, the body loses too much salt, accounting for about 0.5% of the sweat. If the salt is not replenished in time, This causes a serious imbalance in the proportion of water and salt in the body, leading to metabolic disorders.

3. Let indoor air convection

Try to make indoor air convection, so that the flowing wind can cool the house. In addition to saving electricity bills, it is also beneficial to human health, killing two birds with one stone!

4. More fruits and vegetables, less greasy food

There are many kinds of vegetables and fruits in summer and they are rich in nutrients. Bitter melon, winter melon, tomato, loofah, pumpkin, cucumber, watermelon, etc. that are commonly available on the market have cooling and dispelling effects. Some dark fruits and vegetables, such as carrots, mangoes, red and yellow tomatoes, etc., contain a large amount of carotene and phytochemicals, which help to enhance immunity and supplement vitamins, minerals and dietary fiber. Eating greasy food will increase the burden on the gastrointestinal tract, making people feel bloated, not wanting to eat, and feeling more tired. Summer diet should be mainly light and moderate.

5. Drink hot tea

Cold drinks can only temporarily relieve heat, but cannot relieve heat and thirst for a long time. However, drinking hot tea can stimulate the general dilation of capillaries, and the body temperature will be significantly lowered. This is a great, easy-to-do recipe.

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Avoid direct sunlight on your head during outdoor activities, avoid direct absorption of radiant heat by your skin, and wear a hat and loose clothing. Ultraviolet rays can pass through clouds, causing sunburn and making people feel hot. Even on cloudy days, you should apply sunscreen with an SPF of at least 30.

7. Do not exercise strenuously

Summer is when the human body temperature is the highest. At this time, if you stop and rest immediately after strenuous exercise, it will lead to a decrease in blood pressure and possibly even It can cause symptoms such as palpitation, shortness of breath, dizziness, pale complexion, or shock and fainting. To prevent this event from happening, you should do some light exercise after strenuous exercise to allow your breathing and heartbeat to slowly return to normal before stopping to rest.

8. Clothes should not be overly exposed

Experts point out that shirtlessness can only play a cooling role by increasing the skin's radiation and conductive heat dissipation when the skin temperature is higher than the ambient temperature. On hot summer days, the maximum temperature is generally close to or exceeds 37°C. Not only is the skin unable to dissipate heat, but it absorbs heat from the external environment. Therefore, you will feel hotter when you are bare-chested in summer.

9. Plant green plants on windows and roofs

Planting green plants on windows can not only green the environment and reduce dust, but also block the direct sunlight entering the house in summer. Helps reduce ultraviolet rays and lower indoor temperatures.

Planting green plants on the roof can green the roof and reduce the heat accumulated on the roof due to absorption of sunlight, thereby lowering the room temperature.

10. The air conditioner should not be turned on too high

Air conditioning can bring people a comfortable environment. However, if the temperature difference between indoor and outdoor is too large, it will be difficult for people to adapt to the changes in indoor and outdoor temperatures and it is easy for people to catch a cold. Moreover, if the temperature difference between indoor and outdoor is too large, if you do not pay attention to indoor ventilation, the indoor air will be turbid, causing various diseases. Pathogenic microorganisms breed. If a person's body resistance is reduced, he or she will easily get sick. Therefore, the temperature difference when using air conditioners in summer is not likely to be too large, preferably between 5-8 degrees, and the maximum cannot exceed 10 degrees.