The sun brings warmth to the earth, and the temperature varies from place to place in spring, summer, autumn and winter.
In summer, there is direct sunlight in the northern hemisphere, and the ultraviolet rays in the sunlight are strong, which is easy to damage the skin. Girls who love beauty go out to apply sunscreen and wear straw hats to prevent ultraviolet rays; In winter, the direct sunlight gradually moves to the southern hemisphere, and the ultraviolet intensity on the earth in the northern hemisphere weakens, which does little harm to human body. Moreover, when the weather is cold, people have less outdoor activities and receive insufficient ultraviolet rays. At this time, people need more sunshine. Because the right amount of ultraviolet rays can promote the absorption of calcium and help prevent osteoporosis and rickets.
Nowadays, many people sit in the office all day, so they have less opportunities to get close to the sun and less physical activity, which is not good for their health. Medical research shows that everyone should be exposed to the sun for at least 20-30 minutes every day, especially.
What is good for the human body is the morning sunshine.
Sunbathing in winter is also a trick!
Sunbathing in winter is of great benefit to increase the blood circulation of human skin and viscera and improve hematopoietic function. Especially in preventing and treating rickets in children and osteoporosis in adults, it has special curative effect.
But unscientific sunbathing can also bring harm to the body. There are two periods of the day that are most suitable for sunbathing. The first section is from 6 am to 10. At this time, the infrared ray is at the peak, and the ultraviolet ray is low, which makes people feel warm and soft, and can play the role of promoting blood circulation and removing blood stasis. The second stage is at 4-5 pm, when the A-beam of ultraviolet rays is prevalent, which can promote the absorption of calcium and phosphorus in the intestine, help strengthen physical fitness and promote normal calcification of bones.
No matter what season it is, it is forbidden to stay in the sun for a long time between 10 and 4: 00 pm, especially between 12 and 4: 00 pm, because the ultraviolet rays in the sun are R and B beams at this time, which will cause harm to the skin.
In addition, from the measurement concept, staying in the sun for not less than 30-60 minutes every day can balance yin and yang. It is best to wear red clothes in the sun, then white clothes, and it is forbidden to wear black.