How to divide the answers in school in spring, summer, autumn and winter?

The answers in school are divided into spring, summer, autumn and winter as follows. 1.

Astronomical method: The spring equinox, summer solstice, autumn equinox and winter solstice are the beginning of the four seasons.

2.

Solar terms: beginning of spring, Changchun, beginning of autumn and beginning of winter will be beginning of spring, long summer, beginning of autumn and beginning of winter.

3.

Lunar calendar: the first month to March is spring, April to June is summer, July to September is autumn and October to December is winter.

4.

Gregorian calendar: March, April and May are spring, June, July and August are summer, September 10, 1/autumn, 12,12 are winter.