Introduction: Vernal equinox is one of the festivals, belonging to the spring season, many people say that the spring equinox has come, the real spring has come, everything is recovering, spring flowers, want to know what is the meaning of the spring equinox? What does the equinox symbolize? You can come to see my introduction Oh, the equinoxes of the sky is also very special, like to see the sky friends do not miss the equinoxes of the astronomical phenomenon Oh.
What is the meaning of the vernal equinox
The meaning of the vernal equinox is: 1, the seasons are equalized; 2, the day and night are equalized.
1, seasonal equinox: "Spring Equinox" as the name suggests, is the equalization of spring, to the day of the equinox, it means that the spring has passed half.
2, day and night: the equinoxes also have the meaning of day and night, spring this day day day and night, after the equinoxes, the day time is getting longer and longer, the night will gradually become shorter and shorter.
In addition, the spring equinox is also the climate demarcation line, after the spring equinox, the weather is getting warmer and warmer, this is the most comfortable time of the year. It is suitable for going out for spring trekking, sunbathing, exercising and drinking herbal tea. There are also customs such as setting up spring eggs, eating spring vegetables, and sending spring cows.
What the Vernal Equinox Symbolizes
Symbolizes that the day and night are almost equal, equally dividing spring. After the vernal equinox, the sun's direct rays begin to enter the northern hemisphere, and days and nights begin to grow longer and shorter across the northern hemisphere. The vernal equinox represents that the whole spring is already half over. In ancient China, the vernal equinox was divided into three seasons: "The first season is the arrival of the birds; the second season is the sound of thunder; and the third season is the beginning of electricity." This means that after the spring equinox, swallows will fly in from the south, and when it rains, the sky will thunder and send out lightning. Vernal equinox in the Chinese calendar is recorded as: "three days before the equinox, the sun into the equator".
Vernal equinox, the sun moves from south to north on the celestial sphere, running to the intersection of the celestial equator and the ecliptic, this time is called the vernal equinox, is the midpoint of spring in the northern hemisphere (points of the half is also, the day for the half of spring, so it is called the vernal equinox). Vernal equinox occurs around March 21, this day when the day and night are equal, so called "points".
The special features of the equinox are not all related to the "rain". After studying geography, we all know that the most important feature of the equinox is the word "minute", and it's also an equal division. Day and night are almost equal. As a proverb says, "spring and autumn equinoxes, day and night," in the spring equinox (as well as the autumnal equinox) of the day, the physical climate of yin and yang half, day and night average, cold and heat are equal. However, according to China's own calendar, the meaning of "equinox" does not only refer to day and night. In China's earliest calendar of the weather, "the moon season, seventy-two wait Jiejie", but also mentioned "in February, half of the points, this is when half of the ninety days, so it is called the points".
As the saying goes: "Vernal equinox wheat up, fertilizer to follow closely". A spring rain a warm, busy plowing after the spring rain. Spring busy season is about to start, spring management, spring plowing, spring planting is about to enter a busy stage. After the vernal equinox, overwintering crops enter the growth stage, to strengthen field management. As the temperature rises quickly, the water demand is relatively large, farmers should strengthen the storage of moisture.
Vernal Equinox Astronomical Phenomena
Every year around March 20 of the Gregorian calendar, the sun is located in the yellow meridian 0 ° (vernal equinox), for the vernal equinox. On this day, the sun shines almost directly on the Earth's equator, and the day and night are almost equal across the globe (without taking into account the refraction of sunlight by the atmosphere and the morning and evening shadows). After the vernal equinox, the sun continues to shine directly from the equator to the northern hemisphere, the northern hemisphere began to day long and night short, that is, the day is longer than the night; the southern hemisphere began to day short and night long, that is, the day is shorter than the night. Therefore, the vernal equinox is also known as the rising equinox.
And at the north and south poles, on the day of the equinox, the sun is on the horizon for the entire day. Thereafter, as the Sun's point of direct sunlight continues to move northward, a six-month polar day begins near the North Pole, gradually expanding in scope, and a six-month polar night begins near the South Pole, gradually expanding in scope.
It is worth noting that: across the Northern Hemisphere, from the winter solstice, the day is getting longer, but from the spring equinox the day is longer than the night; from the summer solstice, the day is getting shorter, but from the fall equinox the day is shorter than the night.
The reason is: the winter solstice, the sun directly south of the Tropic of Cancer, the northern hemisphere, the shortest day, and then the sun began to move north, the northern hemisphere, the day is getting longer and longer. After the spring equinox, the sun's point of direct sunlight moved to the northern hemisphere, the northern hemisphere began to day longer than the night. By the summer solstice, the sun shoots directly at the Tropic of Cancer, the longest day in the northern hemisphere, and then the sun's point of direct sunlight begins to move south, the northern hemisphere day is getting shorter and shorter. After the autumnal equinox, the sun's point of direct sunlight moved to the southern hemisphere, the northern hemisphere began to day shorter than night.