Look at the picture and answer questions 40 ~ 42. 40. Open the calendar and see the solar terms in the picture (1), and the earth moves in the picture (2) () 4 1. On this day, this night,

Suqian, located in the northern part of Jiangsu Province, belongs to the northern hemisphere.

As can be seen from the schematic diagram of the earth's revolution, when the earth is in position A, the sun shines directly on the Tropic of Cancer, which is the summer solstice in the northern hemisphere, and the date is around June 22nd. When the earth is in position B, the latitude of direct sunlight is the equator, which is the vernal equinox in the northern hemisphere, and the date is around March 2 1; When the earth is in position C, the latitude of direct sunlight is tropic of Capricorn, which is the winter solstice in the northern hemisphere, and the date is about 65438+February 22; When the earth is in position D, the latitude of direct sunlight is the equator, which is the autumn equinox in the northern hemisphere, and the date is around September 23rd.

According to the topic "At 5 pm, Xiaoming who came home from school in Suqian felt the cold wind", it shows that it is already winter in the northern hemisphere, and it also shows that the days in the northern hemisphere are shortened at this time. Therefore, it can be judged that the northern hemisphere is transitioning from autumn to winter, and the direct point of the sun is moving from the equator to the tropic of Capricorn (that is, the autumnal equinox is transitioning from winter to sun).

Therefore, choose: B.