Side view of solar illumination under different solar terms

(1) Autumn Equinox? September 23rd spring equinox March 2nd1

(2) A C (1 dot per grid)

(3) a? Arctic circle and its north? Tropic of Capricorn (2 points per space)

Test and analysis: (1) According to the latitude position difference of the sun's direct point on the track map, it is judged that the sun's direct point at position A is located on the tropic of Capricorn, and it is judged as the winter solstice, while the sun's direct point at position C is located on the tropic of Capricorn, which is the summer solstice, so d stands for the autumnal equinox. B stands for vernal equinox. (2) the law of the earth's revolution speed: perihelion (65438+1early October) has the fastest revolution speed, while apohelion (early July) has the slowest revolution speed, so the earth is closest to perihelion and has the fastest revolution speed after winter solstice A, while it is closest to apohelion and has the slowest revolution speed during summer solstice C. (3) According to the distribution characteristics of the terminator line in the figure: Figure A shows that the terminator line is tangent to the polar circle, the polar night appears in the Arctic circle, and the polar sunrise appears in the Antarctic circle, so it is judged as the winter solstice in the northern hemisphere, and Figure B shows that the terminator line coincides with the meridian, so it is judged as the vernal equinox or the autumnal equinox, while the night in Beijing becomes longer, that is, the day becomes shorter, so it is judged as the autumnal equinox. The first picture shows the winter solstice in the northern hemisphere. There are polar nights in the Arctic Circle and its inner area, and the direct point of the sun is located on the tropic of Capricorn.

Comments: This question is generally difficult and belongs to the regular test center of the earthquake. Students should pay attention to the following points: ① On the orbit diagram of revolution, judge the bisector of the sun according to the latitude position of the direct point of the sun; (2) To master the distribution characteristics of the bisection line; (3) Master the changing law of the earth's revolution speed on the earth's revolution orbit map. For this kind of test questions, students should sort out and summarize the basic methods and laws of solving problems in their usual study.