What is the basis for the division of the four seasons?

1, solar terms: Astronomically speaking, it starts from the vernal equinox, summer solstice, autumn equinox and winter solstice; Beginning of spring, Changchun, beginning of autumn and beginning of winter were the four seasons in ancient China. Based on the position of the earth in orbit. 2. Lunar calendar method: Lunar calendar 1 to March is spring, April to June is summer, July to September is autumn, and 10 to 12 is winter. 3. Gregorian calendar method: Meteorologically, it is usually from March to May 0 to 65438+February of Gregorian calendar. 3. Gregorian calendar method: In meteorology, March to May is usually spring, June to August is summer, September to February is autumn, and 65438+February to February is winter. 4, phenology: willow leaves, peach blossoms, spring is coming; Trees are shady, the sun is hot, and summer is here; Fruit leaves fall, water is cold, and the time sequence is autumn; The grass withered and the flowers withered, the north wind roared, and the years entered the winter. Dongshi