How to see extreme day and night phenomena with pictures, and how to see the winter solstice or summer solstice?

Look at the latitude of the direct sun: the direct tropic of cancer is the summer solstice, and the direct tropic of cancer is the winter solstice. Look at the extreme phenomenon of day and night: the extreme day in the Arctic Circle and its north or Antarctic Circle and its south is the summer solstice, and the extreme night in the Arctic Circle and its north or Antarctic Circle and its south is the winter solstice. The specific picture identification is as follows:

1. This is a side-view sunshine map. As can be seen from the picture, there are polar nights in the Arctic Circle and polar days in the Antarctic Circle, so it can be judged that this picture is a winter solstice sunshine map in the northern hemisphere.

This is a photo overlooking the sun. According to the rotation direction of the earth, it can be judged that this map is a map of the southern hemisphere. As can be seen from the picture, there is an extreme day in the Antarctic circle, which means that the picture is a sunny picture around 65438+February 22. The northern hemisphere is the winter solstice.

This is a side view of sunshine. As can be seen from the picture, there are polar days in the Arctic Circle and polar nights in the Antarctic Circle, so it can be judged that this picture is a summer solstice sunshine map in the northern hemisphere.

This is a photo overlooking the sun. According to the direction of the earth's rotation, it can be judged that this map is a map of the northern hemisphere. As can be seen from the picture, there is an extreme day in the Arctic Circle, indicating that the picture is a sunshine map around June 22. The northern hemisphere is the summer solstice.

Extended data:

Extreme day and night appear at specific times:

1, lunar solar terms

If the direct point of the sun is in which hemisphere, then there will be an extreme night near the polar region of the other hemisphere.

(1) After the vernal equinox, there will be an extreme night near the South Pole, and then it will get bigger and bigger. It reaches its maximum in summer solstice, and the boundary reaches the Antarctic circle;

(2) From summer to the future, the polar night range near the South Pole gradually shrinks to zero at the autumnal equinox;

(3) After the autumnal equinox, extreme night appeared near the North Pole, and then the range of extreme night near the North Pole became larger and larger; The winter solstice reaches its maximum and the boundary reaches the Arctic Circle.

(4) From winter to the future, the polar night range near the North Pole gradually shrinks to zero at the vernal equinox. This cycle is repeated, and its cycle is a tropical year.

2. Gregorian calendar

1. Every year from March 2 1 to September 23, there are polar days in the North Pole and polar nights in the South Pole.

2. Every year from September 23rd to March 20th, at around 2 1, there will be an extreme day in the South Pole and an extreme night in the North Pole.

3. Every year around June 22nd, there will be an extreme day in the Arctic Circle and an extreme night in the Antarctic Circle.

4.65438+ Every year around February 22nd, there is an extreme day in the Antarctic circle and an extreme night in the Arctic circle.

References:

Baidu encyclopedia-extreme day and night