What does it mean that fortune-telling dogs eat the moon? What does it mean that fortune-telling dogs eat the moon?

"Tiangou eats the moon" is the abbreviation of "Tiangou eats the moon", which is an ancient name for the astronomical phenomenon of lunar eclipse.

Lunar eclipse is an astronomical phenomenon, which can be divided into partial solar eclipse, total solar eclipse and penumbral eclipse. The index finger of the moon means that when the moon moves to the shadow of the earth, the area between the moon and the earth will see that the moon is gone, because the sunlight is blocked by the earth; At this time, the sun, the earth and the moon are almost in the same straight line. Eclipses usually occur on the first day of the lunar calendar and the fifteenth day of the lunar calendar. However, solar and lunar eclipses do not occur on the first and fifteenth days of each month.