How can foreigners divide the four seasons without solar terms?

Vernal equinox, summer solstice, autumn equinox, winter solstice. These four dates are the times when the sun shines on the equator, the Tropic of Cancer, the equator and the Tropic of Capricorn, calculated according to the solar calendar. Therefore, it is not difficult for foreigners in the northern hemisphere to distinguish these four times clearly. For example, the movie "The Longest Day" is actually "Summer Solstice", and foreigners are not stupid.