Why lay eggs at the vernal equinox?

It is a traditional custom to divide eggs in spring. It is generally believed that eggs can only be erected on the vernal equinox, and it is difficult to do so at other times. This traditional custom exists in different countries and regions, but its scientific basis is not clear and many people think it is a coincidence.

However, from a scientific point of view, there are some special astronomical phenomena on the vernal equinox, which may be related to spawning. The vernal equinox is the midpoint of spring, the sun shines directly on the equator, and the length of day and night is equal. On this day, the center of gravity of the earth is located on the connecting line between the center of the earth and the sun, that is to say, the gravity field of the earth is relatively balanced on this day, which may make the phenomenon of laying eggs more likely to appear.

However, the relationship between spring egg separation and the relative balance of the earth's gravity field has not been verified by scientific experiments, nor is it a repeatable phenomenon. Therefore, dividing eggs in spring is probably just a traditional custom, and there is no scientific basis.