Which solar term is the extreme sun?

(1) According to the distribution of day and night, it is determined that the Arctic Circle and its northern area are polar nights, with solar terms from winter to sun, and the sun directly shines on the Tropic of Cancer.

(2) During the winter solstice, there are extreme days in the Antarctic circle and its south.

(3) The difference between adjacent meridians in the figure is 30, and point D should be 2 hours after 0; B and D are located on the same meridian and have the same local time.

(4) Point A in the figure is the direct point. At 12 local time, .90e belongs to the East Sixth District, 2 hours away from the East Eighth District. Beijing time is 12 +2 hours = 14 hours.

(5) At this time, the northern hemisphere has the shortest day and the longest night. The higher the latitude, the shorter the day and the longer the night, while the southern hemisphere has the opposite.

So the answer is: (1) winter goes to the solstice and returns to the south.

(2) Antarctic Circle and its south area.

(3)2，b。

(4) 14.

(5) b and c.