Reading and writing the geography of solar terms

(1) According to the graphic analysis, there is an extreme solar phenomenon in the Arctic Circle and its northern region at this time, which indicates the summer solstice in the northern hemisphere. From summer solstice, the sun shines directly on the Tropic of Cancer, and the local time of direct sunlight must be 12: 00. According to the meridian crossing the equator at 6 o'clock in the morning, it can be judged that A is 6 o'clock, so the meridian of 180 is

(2) According to the direction of the earth's rotation, it is not difficult to judge that both A and B are located on the morning line. Draw the latitude circle passing through the second place. According to the length of the solar arc, it can be calculated that the day length of the second place is 16 hours, so the sunset time of the second place = 12+ day length /2 = 20.

(3) According to the answer to the first question, when the meridian 180 is 12 and Beijing time is equal to 120 E, Beijing time can be calculated as 8 o'clock according to these two conditions. Zhongshan Station in Antarctica is located in the Antarctic Circle, which coincides with the summer solstice. However, there is an extreme night phenomenon in the Antarctic Circle and its south area, so Zhongshan Station in Antarctica is completely dark.

(4) From summer to the sun, the Tropic of Cancer and its northern area reached the maximum in a year, and only Jing B was located in the northern area of the Tropic of Cancer, so AD was chosen.

So the answer is:

(1) summer solstice (180, 23 degrees 26 minutes north latitude)

(2) early line? 20

(3)824

(4) AD