Geography in senior high school is a big problem. Please forgive me for asking a lot of questions. The specific questions of each small question are written at the back.

The first question: (0,70e), autumn. According to the conditions provided in the question and the known dividing line between the eastern and western hemispheres. First of all, the western hemisphere and the night hemisphere completely coincide, so the terminal line is 20 degrees west longitude and 160 degrees east longitude, and the direct point of the sun is located on the central meridian of 20 degrees west longitude and 160 degrees east longitude. The calculation method is 160-20 divided by 2 to get 70 degrees, so the western hemisphere is the night hemisphere, so the direct point of the sun is in the eastern hemisphere, so it is 70E. Furthermore, if the western hemisphere coincides with the night hemisphere, then the terminator line also coincides with the meridian, which means that the sun is facing the equator at this time, so the latitude of its direct point is 0. Then, the title shows that the straight guide moves, pointing to the moving trajectory from the vernal equinox: the equator goes north to the Tropic of Cancer (summer solstice), then south to the equator (autumnal equinox), then south to the Tropic of Cancer (winter solstice), and finally north to the equator (vernal equinox). It can be seen from this trajectory that the direct point of the sun moves south after reaching the equator, and it has passed the autumnal equinox, so it is autumn.

The second problem: the solution to the morning twilight circle: it has been given above. According to the autobiographical direction of the earth from west to east, it can be judged that east longitude 160 degrees west enters the night hemisphere, which is a dark line, and west longitude 20 degrees is the morning line.

Question 3: The first question has been found that the direct point is 70 degrees east longitude (the rightmost meridian on the right), so according to the division of 6 equal parts in the figure, every 30 degrees from right to left are 70e, 40e, 10e, 20w, 50w, 80w,1kloc-0/0w respectively.

4. Point B is located in the center of the western hemisphere, so its longitude is180-the longitude of the direct point of the sun, and then the east-west longitude is opposite, that is, west longitude 1 10 degrees. 1 10W has got the position of the third question, which is the leftmost meridian.

Question 5: According to the direction of the earth's rotation and the first question, the meridian at point A is a dark line, that is, 160E E. Together with the global equinox, the local time in the dark line area is 18 hours. As mentioned above, the world is divided equally between day and night, so the day length in all regions is 12 hours, and point C is no exception. Solution of Beijing time: To sum up, when it is known that 160W is 18, its longitude is 40 degrees more than Beijing time, and each degree is 4 minutes, then it is 160 minutes more than Beijing time, and it can be calculated that when Beijing time is 18, it is 65438 minus/. A new day is the meridian (1 10w) from the international international date line (longitude 180 degrees) to the zero position, and the daytime hemisphere is included in it, so the sum of them is equal to 290 180 degrees to the west.