Today, the physics teacher told us with great certainty that winter begins from the solstice, not from beginning of winter. What is right?

There are several ways to divide the four seasons:

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 divide the four seasons by the month of the lunar calendar. 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.

Your teacher is right. He is divided according to astronomy, which belongs to physics.