How are the starting and ending times of the four seasons stipulated?

The four climatic seasons are: March-May in spring; June-August in summer; Autumn September-165438+1October; Winter 12- February

European and American countries take bisection as the starting point of the four seasons, that is, the vernal equinox to the summer solstice is spring, the summer solstice to autumn is summer, the autumn equinox to the winter solstice is autumn, and the winter solstice to spring is winter; In China, beginning of spring, Changsha, beginning of autumn and beginning of winter are the starting points.