Selection of solar terms in sunshine analysis

(1) According to the fact that the Antarctic circle and its south area are extremely bright at this time, it can be judged that this is the winter solstice. From winter to the sun, the latitude of direct sunlight is 23 26, the longitude of direct sunlight is 12, and the longitude of the position bisecting the meridian of the solar hemisphere in the top view is 12. As shown in the figure, the longitude of direct sunlight is 0 (along the earth).

(2) According to the rotation direction of the earth, it can be judged that both A and B are on the dark line. Draw the latitude circle of B. According to the length of the solar arc, it can be calculated that the day length of B is 18 hours and the sunrise time is = 12- day length /2, so the sunrise time of B is 3 o'clock.

(3) According to the latitude of Kunlun Station, it can be seen that Kunlun Station is located in the Antarctic Circle, and it is winter solstice, and the Antarctic Circle and its south area are extremely daytime, so the night of Kunlun Station is 0: 00. According to the rotation direction of the earth, B is in the east of A and B is in the south of A, so B is in the southeast of A. 。

The summer solstice will be in six months. From summer to the sun, the height of the tropic of cancer and its north noon sun reaches the maximum in a year, and reaches the minimum in all parts of the southern hemisphere, so AD is chosen.

(5) At this time, it is the winter solstice, and there are many days in the Antarctic circle and its south, which is conducive to scientific investigation, so it is credible.

So the answer is:

(1) winter solstice 23 26' s? 0

(2) faint? Three o'clock?

(3)0? southeast

(4) AD

(5) credibility