The geographical interest group of a school in Zaozhuang measured the shadow length of the school flagpole at noon on the vernal equinox, summer solstice, autumn equinox and winter solstice respective

The geographical interest group of a school in Zaozhuang measured the shadow length of the school flagpole at noon on the vernal equinox, summer solstice, autumn equinox and winter solstice respectively. When the sun shines directly on the tropic of cancer, it is the summer solstice in the northern hemisphere (the date is around June 22). On this day, the sun's altitude angle in the northern hemisphere is the largest, so the shadow of the school flagpole is the shortest at noon; When the sun shines directly on the tropic of Capricorn, it is the winter solstice in the northern hemisphere (the date is around 65438+February 22). On this day, the sun's altitude angle in the northern hemisphere is the smallest, so the shadow of the flagpole in the school is the longest at noon; When the sun shines directly at the equator, it is the vernal equinox (the date is around March 2 1 day) or the autumn equinox (the date is around September 23) in the northern hemisphere. On this day, the solar altitude angle in the northern hemisphere is between the winter solstice and the summer solstice, so the noon shadow length of flagpoles in schools is also between the winter solstice and the summer solstice. Therefore, it can be judged that A is the shadow length measured during the winter solstice, and B and C are vernal equinox respectively.

June of 12 is closest to the summer solstice, so at noon of June of 12, the shadow length of the school flagpole is closest to D in Figure 2.

Therefore, choose: d.