What season is it all over the world now? What is the dividing line between seasons?

When it is spring in the northern hemisphere, autumn in the southern hemisphere, summer in the northern hemisphere, winter in the southern hemisphere, autumn in the northern hemisphere, spring in the southern hemisphere, winter in the northern hemisphere and summer in the southern hemisphere.

Now it is spring in all parts of the northern hemisphere and autumn in the southern hemisphere. Although the four seasons in the same hemisphere are the same, the climate is not necessarily the same.

Climate is influenced by latitude, season, altitude, monsoon and land and sea position.

For example, the Qinghai-Tibet Plateau is the coldest in China in summer, which is affected by altitude.

For another example, the latitude position of Sichuan basin and the plain in the middle and lower reaches of the Yangtze River is roughly the same. However, the Sichuan Basin is inland, and it is difficult to reach the summer monsoon due to the barrier of the Himalayas. The plain in the middle and lower reaches of the Yangtze River is close to the ocean and is greatly influenced by the summer monsoon. So there are some differences between the two climates.

Regarding the division of seasons, there are the following methods:

1. Astronomical division method From the astronomical phenomenon, the change of four seasons is the seasonal change of the length of day and night and the height of the sun. In a year, the season with the longest day and the highest sun height is summer, the season with the shortest day and the lowest sun height is winter, and the transitional season between winter and summer is spring and autumn. Therefore, the astronomical division of the four seasons is based on the vernal equinox (March 2 1), summer solstice (June 2 1), autumn equinox (September 2 1) and winter solstice (February 2 1). Namely: spring from the vernal equinox to the summer solstice, summer from the summer solstice to autumn, autumn from the autumn equinox to the winter solstice, and winter from the winter solstice to spring.

2. The meteorological division method of meteorological department: March-May is usually spring, June-August is summer, 9-1 65438+1October is autumn, 12- February is winter,1,April, July and the following year.

3. In the ancient classification, beginning of spring (February 4th or 5th) is beginning of spring, Changxia (May 5th or 6th) is long summer, beginning of autumn (August 7th or 8th) is beginning of autumn, and beginning of winter (165438+1October 8th or 9th) is beginning of winter.

In China, it is customary to use the month of the lunar calendar to divide the four seasons. Lunar calendar1~ March is spring, April-June is summer, July-September is autumn, and 10 ~ 12 is winter. The first day of the first month is the first day of the year and the first day of spring, so it is also called the Spring Festival.

Books: compulsory units 1, 1 and 2 of geography in senior high school ~