Stand on the solar terms

(1)A is the summer solstice, B is the autumnal equinox, C is the winter solstice, and D is the vernal equinox.

(2) One day at noon, people standing in Guangzhou Tropic of Cancer Sign Park found that they could not see their own shadow. This day should be June 22, when the sun is directly on the Tropic of Cancer, and the days in the northern hemisphere are long and the nights are short.

(3) At the vernal equinox, the sun shines directly at the equator. At this time, the length of day and night is equally divided around the world.

So the answer is:

(1) Summer solstice; Vernal equinox; Solstice of winter; Vernal equinox;

(2) June 22; Dragon; Short;

(3) the equator; Divide day and night equally.