Many readers have heard of the Tengu Eclipse Day, when I was a child, my mother also told me the story of the Tengu Eclipse Day, and then told me its principle, but at that time I was only six or seven years old, I couldn't understand it at all, and after listening to the principle, I still looked up at the sky from time to time, looking for the Tengu, so that any strange cloud was regarded as a tengu.
Moon under a total solar eclipse
The principle of a total solar eclipse is very simple, in a word, it is a point on the earth that is in the umbra region of the moon. In this way, the eclipse area of the earth looks at the sun as shown in the above figure, the black object shown in the above figure is the moon, the side of the moon facing the earth is completely black, the side facing the earth is exactly facing the sun, illuminated by the sun, and the sun is completely blocked by the moon, and only the corona (coronal layer) with blurred edges can be seen.
The difference between a total solar eclipse and an annular solar eclipse
There are two conditions required for a total solar eclipse to occur:
1. The Moon is at the center of the Sun and the Earth
2) The umbra of the Moon can reach the Earth
The first condition is easy to understand, because the earth orbits the sun, the moon orbits the earth, and when it is in a certain period of time, the moon is in the middle of the sun and the earth.
The second condition determines whether it is a total solar eclipse or an annular eclipse, as shown in the image above, the upper lunar umbra cone reaches the Earth, and the lower part is the extension of the lunar umbra cone to reach the Earth. Since the light travels in a straight line, the solar rays in the in-vibra region cannot bypass the moon to reach the Earth in any way, which is a total solar eclipse.
But if the moon and the Earth are exactly farther apart, the light from the sun's edge can bypass the moon to reach the umbra extension zone of the earth, which is the annular eclipse.
From partial solar eclipse to total solar eclipse, to the normal whole process
The above picture is the whole process from partial solar eclipse to total solar eclipse, and then to the normal, I hope my explanation can answer your doubts. The most recent total solar eclipse in China will appear on March 20, 2034, in the mountains of northern Tibet, and on September 2, 2035, another total solar eclipse will occur in northern China, and astronomers can pay attention to it.
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