In which solar term does the earth rotate fastest?

(1) The left picture shows the dichotomy of the sun, and the right picture shows the regression motion of the direct point of the sun. A is the vernal equinox, pointing to the equator, B is the summer solstice, pointing to the tropic of cancer, C is the autumnal equinox, returning to the equator, and D is the winter solstice, pointing to the tropic of cancer.

(2) At perihelion time of 65438+1early October, the earth's revolution speed is the fastest, so the closest solar term is the winter solstice, so it is relatively fast at point D. 。

(3) The southeast coast suffered the most typhoon disasters in summer and autumn.

(4) At C, the world is divided equally between day and night, and at D, the day is the shortest and the night is the longest in the northern hemisphere. So the change of day and night in C-D is from equal length to short day and long night to short day and long night.

So the answer is: (1) summer solstice? Spring Equinox

(2)D？

(3)B？ c？

(4) From equal length of day and night to short day and long night and then to short day and long night.