(1) On this day, the northern hemisphere is _ _ _ _ (solar terms), and the Antarctic circle appears _ _ _ _ _ _. (2) The geographical coordinates of point A are _ _ _ _ _ _ _ _, and the sunset time of point C.

(1) According to the direct sunlight, it can be judged that the Arctic Circle and its northern area are polar days, which are the summer solstice in the northern hemisphere, and the Antarctic Circle and its southern area are polar nights.

On the summer solstice, the sun shines directly on the Tropic of Cancer. According to the number of 120 W and the direction of the earth's rotation, it can be judged that the meridian of direct sunlight is 60° E；; ; Point C is located at the equator, divided equally between day and night, and the sunset time is 18.

(3) Of the four points A, B, C and D in the figure, point A is in the daytime hemisphere, point C is in the morning line, and points B and D are in the night hemisphere; In summer solstice, the noon sun height gradually decreases from the tropic of cancer to the north and south sides, and the minimum noon sun height is D.

(4) On the Chenxi Yu line at point E, the height of the sun at the finish line is equal to 0, H = 90°- the latitude difference between them is 90-(66 34'-23 26') = 46 52'.

So the answer is:

Summer solstice? polar night

(2) (23 26' N and 60 E)? 18

(3) A.D.

(4)0 ? 46 52′