Geographical problems of vernal equinox and solar terms

1, C. Because the sun is closest to the Tropic of Cancer and Shanghai is north of the Tropic of Cancer, the closer the sun is to the Tropic of Cancer, the longer the day in Shanghai, so it is C.

2, D. Nanjing is equally divided day and night, indicating that it is the vernal equinox or the autumnal equinox, and the global noon sun is equally high.

3, B. The angle between the earth axis and the ecliptic plane becomes larger, which means that the intersection angle between the ecliptic and the equator becomes smaller, which means that the tropics become smaller. Because the latitude of the polar circle adds up to 90 degrees, the latitude of the polar circle becomes larger, and the latitude of the polar circle becomes larger, which means that the cross area becomes smaller, so the cold zone becomes smaller. In the tropics, the frigid zone becomes smaller and the temperate zone becomes larger.

Remember here that the tropics get bigger, the frigid zone gets bigger, the tropics get smaller, and the frigid zone gets smaller.

4, C. From the vernal equinox to the autumnal equinox, it is 32 1 to 923. The sun first goes north and then south, and the direct point is from the equator to the tropic of cancer, and then from the tropic of cancer to the equator. So north of the Tropic of Cancer, the shadow always goes north.

5, D. When the earth is at perihelion, it is 65438+1early October, and the sun is just north of the Tropic of Capricorn, pointing northward.

6, C. Except the vernal equinox and autumnal equinox, other times do not coincide, and the maximum included angle between the termination line and the earth axis should be 23.5 degrees.

7, a. Every year from the vernal equinox to the autumnal equinox is 32 1 to 923. The sun goes north first, then south. It is summer in the northern hemisphere and winter in the southern hemisphere. The North Pole extends to the Arctic Circle and then contracts from the Arctic Circle to the North Pole.

8. C. When the solar altitude angle is added at noon, the included angle α between the heat absorption surface of the water heater and the ground should be 90 degrees. After calculation, the local noon sun altitude angle is 8 1.5 degrees.

9，b。

10，d。

9, 10 is not explained, it is all calculated, and I can't tell. This is a tough battle. If you don't know, just call me.

1 1, (1) 70 e 23.5 n15: 20: 20w in summer in the northern hemisphere.

(2) 24 hours at 90 O point a

(3) Winter in North Temperate Zone