What do you mean, four seasons is another autumn?

It means that the four seasons, spring, summer, autumn and winter, change and exchange year after year, without endless cycles.

It is generally used to describe the change and passage of time. Refers to the cycle of alternating four seasons in a year, that is, spring, summer, autumn and winter. In climate, the four seasons are distinguished by temperature. In the northern hemisphere, generally speaking, March-May is spring, June-August is summer, September-165438+1October is autumn, and12-February is winter.

In the southern hemisphere, the time of each season is just the opposite of that in the northern hemisphere. It is summer in the southern hemisphere and winter in the northern hemisphere; It is winter in the southern hemisphere and summer in the northern hemisphere. There is no obvious boundary between seasons, and the change of seasons is gradual.

geographical phenomena

China has a vast territory in low, middle and high latitudes. Low latitude generally refers to the spatial range between 30 degrees north and south latitude on the earth's surface, that is, the area between 30 degrees north latitude and 30 degrees south latitude, including tropical and subtropical hot spots, which is the area where global solar radiation and heat are concentrated.

Mid-latitude is the latitude zone between 30 and 60 degrees north latitude. The air masses prevailing in high and low latitudes overlap each other in this area, with frequent cyclone activities and obvious temperature changes. High latitude refers to the area between 60 degrees north and south latitude and the north and south poles on the earth's surface, which is the weakest area on the earth's surface to receive solar radiation.

The southern region of China (low latitude region) is rainy, stormy, sunny and high in humidity, and these changes are obvious when the seasons change; There is little rain and storm in the northern region (mid-latitude region), and the temperature changes obviously when the seasons change.

The traditional method of dividing the four seasons in China is based on the change of astronomical phenomena, with the "four stands" in the 24 solar terms as the starting point of the four seasons. Now the four seasons are often divided according to the temperature change.

According to the division of "climatic average temperature" by modern scholar Zhang Baokun, the four seasons are basically consistent with the "climatic average temperature", and the temperature changes in low latitude areas and polar regions are not obvious.