Write the solar terms of vernal equinox, summer solstice, autumn equinox and winter solstice-

Equinox: The world is characterized by infinite days and extremely long nights. The northern and southern hemispheres are equally divided day and night.

Summer solstice: the sun shines directly on the Tropic of Cancer, the Arctic Circle and its interior are extremely daytime, the Antarctic Circle and its interior are extremely nighttime, and the northern hemisphere has long days and short nights. The farther north, the longer the days and the shorter the nights. In the southern hemisphere, the days are short and the nights are long. The farther south, the shorter the days and the longer the nights.

Winter solstice: the sun shines directly on the Tropic of Capricorn, the Arctic Circle and its inner polar night, and the Antarctic Circle and its inner polar day. In the northern hemisphere, the days are shorter and the nights are longer. The farther north, the shorter the days and the longer the nights. The days are long and the nights are short in the southern hemisphere. The farther south, the longer the day and the shorter the night.