As shown in the figure, the solar illumination map of a certain day, at this time, the solar terms in the northern hemisphere are a. vernal equinox B. summer solstice C. autumn equinox D. winter solst

As shown in the figure, the solar illumination map of a certain day, at this time, the solar terms in the northern hemisphere are a. vernal equinox B. summer solstice C. autumn equinox D. winter solstice. D

Analysis of test questions: According to the picture, the sun shines directly on the Tropic of Capricorn, the days in the northern hemisphere are short and the nights are long, the Arctic Circle and its northern region appear extreme night phenomenon, and the Antarctic Circle and its southern region appear extreme day phenomenon. It is interpreted as the winter solstice in the northern hemisphere. So choose option d in this question.

Comments: According to the position of the direct point of the sun, the position of the earth in the orbit of revolution, and the length of day and night in the northern and southern hemispheres, we can judge the solar terms of the earth. From summer to morning in the northern hemisphere (around June 22), the sun shines directly on the Tropic of Cancer, the days in the northern hemisphere are long and the nights are short, and the Arctic Circle and its north are extremely day. During the winter solstice (about 65438+February 22nd), the sun shines directly on the Tropic of Capricorn, and the days in the northern hemisphere are short and the nights are long, and the Arctic Circle and its northern region are extremely night. At the equinox, the sun shines directly at the equator, and the whole world is as long as day and night.