The Spring Equinox is also called "Egg Day"? How did the custom of standing eggs upright during the Spring Equinox come about?
Introduction: Some people cleverly call the Spring Equinox "Egg Day"? Why is it called so specially? It turns out that this is related to a traditional custom of the Spring Equinox, which is called standing eggs upright. What are the specific content of this custom? Let’s explore it together! The second month of the lunar calendar tells the stories of every day in February, bringing you the do's and don'ts of every day in February, as well as the directions of the God of Wealth and the God of Happiness, etc., making you full of expectations.Is the Spring Equinox also the “Egg Setting Day”?During the Spring Equinox in the lunar calendar, there is a folk saying that goes "When the Spring Equinox comes, the eggs will be prettier." It is said that it is easiest to stand an egg upright on the day of the Spring Equinox, and there is a saying that goes: "If you can't stand it upright on the day of the Spring Equinox, then you basically won't have a chance all year." As for the reason, there is an "authoritative explanation" on Weibo that looks quite astronomical. On the day of the Spring Equinox, the day and night are equal in the northern and southern hemispheres, and the Earth's axis, which is tilted at 66.5 degrees, is in a state of relative balance of force with the plane of the Earth's orbit around the sun, so an egg is best able to stand upright.Why is it easy for an egg to stand upright on the Spring Equinox?Although there are many theories, there are many scientific reasons behind them. Firstly, the vernal equinox is a day when the day and night are of equal length in the northern and southern hemispheres. The Earth's axis, which is tilted at 66.5 degrees, and the orbital plane of the Earth's revolution around the sun are in a state of relative balance of forces, which is conducive to standing the egg upright. Secondly, the vernal equinox is in the middle of spring, which is neither too cold nor too hot, with red flowers and green grass. People feel relaxed, their minds are quick, their movements are agile, and it is easy to successfully stand an egg upright.More importantly, the surface of the egg is uneven, with many protruding "hills". The "mountain" is about 0.03 mm high, and the distance between the peaks is between 0.5 and 0.8 mm. According to the principle that three points form a triangle and determine a plane, as long as we find three "hills" and the triangle formed by these three "hills", and make the center of gravity of the egg pass through this triangle, then the egg can stand upright. In addition, it is best to choose eggs that are 4 to 5 days old. This is because the yolk band of the egg relaxes, the yolk sinks, and the center of gravity of the egg drops, which is conducive to the egg standing upright. Standing an egg on the spring equinox is just a form of fun, with no scientific explanation?On the vernal equinox every year, thousands of people around the world will do the "egg standing up" experiment. It is still difficult to verify how this game, which is called a "Chinese custom", became a "world game". However, the gameplay is simple, easy and fun: choose a smooth and symmetrical fresh egg that has been laid just four or five days ago, and gently stand it upright on the table. Although there are many failures, there are also many successes.In fact, standing an egg upright has nothing to do with the vernal equinox. Whether an egg can stand upright depends on the earth's gravity and the condition of the egg itself. The effect of the vernal equinox on the earth's gravity is negligible, but when standing an egg, the yolk plays a big role. The sinking of the yolk will lower the center of gravity of the egg. In addition, the eggshell itself is uneven. As long as you find three protruding points, the egg can stand up after balance. However, why can an oval-shaped egg stand upright? In fact, although the eggshell is a curved surface, the part where it contacts the table is not a point. The curvature of the large end of the eggshell is relatively small. Thus, for a very small area, it is approximately a plane. This extremely small plane is sufficient as a support point to allow the egg to stand steadily. Someone once did a similar experiment. They placed an upright egg on carbon paper and then observed the contact surface between the egg and the carbon paper. It was found that the tips of at least three protruding points on the eggshell surface were stained with the color of the carbon paper. This is what scientists call the "tripod theory." Experts say that, in fact, an egg can stand upright on any day of the year. Citizens can try this at home: take a fresh egg, turn its big end downward, and gently place it on the table. Carefully find the balance point and don't let go until it stops falling. Moreover, the eggs that stand upright can remain standing for more than ten days without any external interference. According to folklore expert Shi Lixue, "standing eggs on the Spring Equinox" has a history of 4,000 years in my country, and the inheritance of folk culture requires the participation of more people. Summary: The above article is a detailed analysis of the custom of standing eggs on the Spring Equinox. Regardless of whether the Spring Equinox is really conducive to standing eggs, this is a fun game set up by people to celebrate this day. We need to experience traditional culture with our heart! |
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