What is the vernal equinox

The meaning is as follows: 1 "Equinox in Spring and Equinox in Autumn, divided equally between day and night".

On the vernal equinox, the sun shines directly on the equator, which is almost equal to the length of day and night in the world, that is, the time of day and night is equal, which is 12 hour. Second, "season sharing".

If the period from the beginning of spring to the long summer is regarded as spring, then the vernal equinox is the midpoint of spring, which just divides spring equally. It is exactly ninety days from beginning of spring to Changchun, and the vernal equinox is divided into two, hence the name vernal equinox.

For example, in 2006, the interval between the vernal equinox on February 4th and beginning of spring was 45 days, and the interval between the vernal equinox on May 5th and the long summer was just 45 days. The vernal equinox is also a traditional festival. In ancient China, beginning of spring, Changxia, beginning of autumn and beginning of winter were used to indicate the beginning of the four seasons.

Extended data:

Every year on March 20th of the Gregorian calendar, when the sun is located at 0 (vernal equinox), it is the vernal equinox. On this day, the sun shines almost directly on the equator of the earth, and the whole world is almost as long as day and night (regardless of the refraction of sunlight by the atmosphere and the shadow in the morning).

After the vernal equinox, the direct point of the sun continues to move from the equator to the northern hemisphere, where the days are long and the nights are short, that is, the days are longer than the nights in a day; In the southern hemisphere, the days are shorter and the nights are longer, that is, the days are shorter than the nights in a day. Therefore, the vernal equinox is also called the ascending equinox.

At the North Pole and the South Pole, at the vernal equinox, the sun is on the horizon all day. After that, as the direct point of the sun continued to move northward, a six-month polar day began near the North Pole, and the scope gradually expanded; A six-month polar night began near the Antarctic, and the scope gradually expanded.

References:

Equinox-Baidu Encyclopedia.

What is the traditional significance of the vernal equinox?

Equinox has two meanings.

First, it refers to "vernal equinox and autumnal equinox, which are equally divided day and night". On the vernal equinox, the sun shines directly on the equator, which is almost equal to the length of day and night in the world, that is, the time of day and night is equal, which is 12 hour.

At this time, after half a year of darkness, the North Pole saw the sunshine for the first time on this day, and the corresponding South Pole will also bid farewell to the sunshine on this day. After the vernal equinox, the position of the direct sunlight point moves to the north, and the day time in the northern hemisphere becomes longer and the night time becomes shorter, but the difference is that the day time in the southern hemisphere becomes shorter and the night time becomes longer.

The second refers to "season sharing". If the period from the beginning of spring to the long summer is regarded as spring, then the vernal equinox is the midpoint of spring, which just divides spring equally.

It is exactly ninety days from beginning of spring to Changchun, and the vernal equinox is divided into two, hence the name vernal equinox. For example, in 2006, the interval between the vernal equinox on February 4th and beginning of spring was 45 days, and the interval between the vernal equinox on May 5th and the long summer was just 45 days.

The vernal equinox is also a traditional festival. In ancient China, beginning of spring, Changxia, beginning of autumn and beginning of winter were used to indicate the beginning of the four seasons.

What does the vernal equinox mean? What are the solar terms?

The vernal equinox is the midpoint of 90 days in spring.

Every year on March 20th of the Gregorian calendar, when the sun is at 0 (vernal equinox) of the Yellow Meridian. On the vernal equinox, the sun shines directly at the equator of the earth, and the seasons in the northern and southern hemispheres are opposite. The northern hemisphere is the vernal equinox and the southern hemisphere is the autumnal equinox.

The vernal equinox is one of the 24 solar terms and a traditional festival. In the Zhou dynasty, there was a ceremony to worship the sun at the vernal equinox.

Book of Rites: "Altar." Confucius' Ying Da Shu: "Also called the vernal equinox."

This custom has been handed down from generation to generation. On the day of vernal equinox, the sun shines directly on the equator, and the length of day and night is almost equal, which is exactly half of the 90th day of spring, so it is called "vernal equinox".

After that, the direct sunlight position gradually moved northward, and the days began to get longer and the nights began to get shorter. Extended data:

The vernal equinox is an important solar term, which not only has astronomical significance: the northern and southern hemispheres are equally divided day and night, but also has obvious characteristics in climate. At the vernal equinox, except the Qinghai-Tibet Plateau, the northeast, the northwest and the northern part of North China, China entered a beautiful spring.

During the vernal equinox, the daily average temperature in all parts of China rose steadily to above 0℃ except the alpine mountain area and the area north of 45 north latitude. At this time, the cold has passed and the temperature has risen rapidly, especially in North China and Huanghuai Plain. The daily average temperature rises to above 10℃ almost at the same time as the rainy areas along the Yangtze River and the south of the Yangtze River, entering a bright spring.