2. When the sun shines directly, the earth's surface gets more heat and the temperature is high, which is summer; On the contrary, when the sun is tilted, the heat gained on the earth's surface is low, which is winter. When the sun shines directly into the northern hemisphere, it is summer in the northern hemisphere and winter in the southern hemisphere; On the contrary, when the sun shines directly into the southern hemisphere, it is summer in the southern hemisphere and winter in the northern hemisphere.
Extended data:
Four seasons health:
1, keeping in good health in spring focuses on nourishing yang, liver and wind, and exercising to strengthen the body. ?
Spring is suitable for nourishing the liver, and the liver likes to be comfortable, so keep a happy mood in spring. Go to bed late and get up early in spring, go to bed before 1 1 at night, get up early and stretch, and wear a thick bottom and a thin top. The back, abdomen and feet are the key points to keep warm. In addition, in spring, Qin Ying is prone to respiratory diseases. Clean the room away from pollen, and at the same time, do more exercise to strengthen your physique.
2, summer health care focuses on nourishing the yang and nourishing the heart, and clearing heat is a must. ?
In summer, you should nourish your heart, the weather is hot and irritable, and you should keep your body and mind happy. Get up early in summer, get up at about 6: 30 to exercise, and take a nap at noon to make up for sleep. Sweat-absorbing and breathable fabrics are the first choice for dressing, and tights should be worn less. Don't be too intense and strenuous in exercise, it is advisable to sweat a little.
3, autumn health care focuses on nourishing yin and preventing dryness, conditioning lung qi. ?
Autumn is easy to be depressed and hurt, so we should keep a happy mood and prevent excessive sadness. It is dry in autumn, and indoor humidity should be maintained. In order to prevent dry skin, you can apply various skin creams. In autumn, you should go to bed early and get up early, take part in various sports, such as mountain climbing and walking, and insist on strengthening cardiopulmonary function for a long time to avoid strenuous exercise.
4, winter health care focuses on nourishing yin and suppressing yang, tonifying kidney and preventing cold. ?
Keeping healthy in winter, keeping quiet and cheerful, and getting more sunshine can relieve winter drowsiness. Clothing should be based on the principle of warmth and comfort, paying attention to the warmth of head, back and feet. Go to bed early in winter to nourish the yang. It is best to get up after the sun comes out, and choose aerobic exercise with small exercise range and high calorie consumption, such as swimming, running, playing ball, climbing mountains and walking.
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