Autumn is the harvest season, and many plants mature in autumn. In the subtropical region of the northern hemisphere, the temperature in autumn is obviously lower than that in summer. As the temperature drops, the leaves of many deciduous perennial plants will gradually change color, wither and fall off. The main meteorological disasters in autumn are autumn rain in West China, cold dew wind in the south, frost and chilling injury at low temperature.

Changes in autumn

In autumn, the direct point of the sun gradually moves south from the northern hemisphere, passes through the equator after the autumnal equinox, and the sun directly shines in the southern hemisphere. Seen from the northern hemisphere, the angle of the sun gradually becomes lower, and the gap between day and night becomes smaller. At the autumnal equinox, the length of day and night is equal. In autumn, the distance between the earth and the sun is from far to near. Seen from the ecliptic plane, the sun is on the background of Leo, Virgo and Libra.

Autumn is the best time to keep fit, so you should eat vegetables. Vegetables can not only preserve health, but also help treat some diseases. Autumn is dry, eat more green leafy vegetables, because the vitamin content is high, it is good to eat more. Dark vegetables such as spinach, green vegetables, celery, chrysanthemum, amaranth, carrots, etc. Like brown-red vegetables, they are rich in vitamins and carotene.

Autumn is one of the four seasons. Meteorologically, autumn in the north temperate zone is on August 23rd165438+1October 20th, and autumn in the south temperate zone is from February 19 to May 2nd1day.