Why should the autumnal equinox lay eggs? What is the reason why the autumnal equinox is equally divided day and night?

The autumnal equinox is the solar term after the Millennium solar term. At the autumnal equinox, the length of day and night is equal, but many people have great doubts about this issue. What is the reason why the autumnal equinox is equally divided day and night? Why can the autumnal equinox stand eggs? Let's learn about this solar term with the old calendar!

The reason why the autumnal equinox is equally divided day and night

The alternation of day and night is caused by the rotation of the earth. On the day of the autumnal equinox, the sun reaches the longitude of the yellow meridian 180 degrees, and directly hits the equator of the earth. Therefore, in most parts of the world, the 24-hour day and night are equally divided, each being 12 hour. The earth is constantly rotating, and objects moving horizontally on the ground will inevitably shift to the right (northern hemisphere) or to the left (southern hemisphere). According to this phenomenon, people can prove that the earth is rotating by analyzing the direction of the projectile. The earth keeps spinning. Due to the inertial centrifugal force, the acceleration of ground gravity is the smallest at the equator and the largest at the poles. The earth can't be a right sphere, but it must be a rotating ellipsoid with slightly protruding equator and slightly flat poles. The results of gravity survey and circular arc survey confirm the correctness of these views, which also confirms the rotation of the earth from one side.

The earth rotates all the time, because the rotation speed increases with the increase of height, objects will inevitably have higher rotation speed to the east in the process of falling from a height, and will inevitably fall to the east. To prove this, someone once conducted an experiment in a deep well. The test results show that objects falling from the center of the wellhead always collide with the east wall of the mine at a certain depth, which proves the rotation of the earth from another side.

Why can the autumnal equinox stand eggs?

Reason 1: On the day of the autumnal equinox, the northern and southern hemispheres are divided equally day and night. The earth axis inclined at 66.5 degrees is in a relatively balanced state with the earth's orbital plane around the sun, and the earth's magnetic field is also relatively balanced, so the egg stands best.

Reason 2: The autumnal equinox is in the middle of autumn, neither too cold nor too hot. People are comfortable, quick-thinking and easy to succeed in laying eggs.