What is the sixteenth solar term?

The sixteenth solar term is the autumn equinox.

The twenty-four solar terms are:

Keywords beginning of spring, rain, fright, vernal equinox, Qingming, Grain Rain,

Long summer, small man, mangzhong, summer solstice, xiaoshu, dashu,

Keywords beginning of autumn, intense heat, white dew, autumnal equinox, cold dew, first frost,

Beginning of winter, light snow, heavy snow, winter solstice, slight cold, severe cold.

(Spring rain surprises spring and clear valley days, summer is full of mountains and summer is connected with heat, autumn dew is frosty, and winter snow drifts. )