Solar terms in cold areas of northern China

Looking at the map, we can see (1) that all the Arctic circles have extreme sunlight, so it is the summer solstice; (2) Divide the plane circle into six parts on average, and the difference between two adjacent meridians is 30, which is located to the west of the 0 meridian. It is calculated that the longitude for A is 30 W; located at the equator; and the latitude is 0. (3) There is direct sunlight in the tropics, and there are A, B and E in the tropics; Cold with extreme day and night, cold with D; (4)D is located in the north of the Arctic Circle, belonging to the northern cold zone, and E is located between the Tropic of Cancer, belonging to the tropics; (5) From summer to the sun, the sun shines directly on the Tropic of Cancer, the days in the northern hemisphere are long, and the nights in the southern hemisphere are short, so the day with short nights is C; (6) According to the longitude line representing the north-south direction and the latitude line representing the east-west direction, it is determined that D is just north of B and A is northwest of C. 。

Therefore, the answer is: (1) summer solstice; (2)30w； 0 ; (3)A、B、E； d； (4) the north is cold; Heat; (5)C； (6) due north; Northwest direction.