Simplify revolutionary solar terms

(1) The name of the solar term revolving around the earth in the picture: A is the vernal equinox; B is the summer solstice; C is the autumn equinox; Ding is winter;

(2) When the earth revolves around B, the sun shines directly on the Tropic of Cancer, and the daytime in Taizhou is the longest in a year. When the earth revolves around A and C in the picture, that is, the vernal equinox and the autumnal equinox, the day in Taizhou is as long as the night.

So the answer is:

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

(2) Returning to the North; Dragon; a； C.