After Li's speculation, the generations after the Tang Dynasty believed more in the ominous astronomical phenomenon of "dogs eat the sun". In fact, Li and other feng shui masters are only the promoters of further expanding the illusory power of "Tiangou Food Day", which was already defined in the Spring and Autumn Period before this.
Extended data:
Types of solar eclipses
1, annular eclipse
When the moon is at apogee, the umbra cone of the moon cannot reach the earth; What reaches the earth is the pseudo-umbra cone extended from the umbra cone. At this time, the apparent diameter of the moon is slightly smaller than that of the sun. Therefore, the photosphere on the edge of the sun is still visible at this time, forming a bright ring around the shadow of the moon. Outside the eclipse belt, the solar eclipse seen is a partial eclipse. The last annular solar eclipse occurred on May 20 10 13.
2. Total solar eclipse
Only when the earth's surface is very close to the top of the lunar umbra, or the distance between the moon and the earth's surface is very close to the length of the lunar umbra, will a total lunar eclipse occur. Because the earth is a sphere, when the umbra cone touches the earth, it is a total solar eclipse (usually in the middle of the eclipse zone). Because the umbra cone can't touch the earth at both ends of the food belt, only the pseudoumbra can reach below the earth, and it sees an annular eclipse.
Therefore, when the total solar eclipse occurs, with the relative movement of the earth and the moon, there will be annular eclipses → total solar eclipse → annular eclipse one after another. Of course, for a specific place, it is impossible to see a total solar eclipse and an annular solar eclipse at the same time in an eclipse. The probability of total lunar eclipse is very small. The last total lunar eclipse occurred at 20 13, 1 1.3.