When the Tropic of Cancer sign in Conghua, Guangzhou disappears, what day is the next day () A. Equinox B. Summer solstice C. Equinox

Analysis of test questions: When the sign of the Tropic of Cancer in Conghua, Guangzhou disappears, it means that the noon sun height angle of the Tropic of Cancer is 90. It means that the sun went straight to the Tropic of Cancer that day. The revolution direction of the earth is from west to east. When the sun shines directly on the Tropic of Cancer, this day is called the summer solstice, that is, June 22nd. When the sun directly hits the equator for the first time, this day is called the vernal equinox, that is, March 21; The second direct event on the equator is the autumnal equinox, which is September 23; When the sun shines directly on the tropic of Capricorn, this day is called the winter solstice, that is, 65438+February 22. So this question chooses option B.

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.