What is the difference between the vernal equinox and the beginning of spring? The point of direct sunlight is different

Generally, the beginning of spring will come earlier every year, and the vernal equinox will be behind the beginning of spring, so many people don’t know which of the two solar terms with spring represents the arrival of spring.What kind of difference is there, let’s find out now.

The difference between the vernal equinox and the beginning of spring

Obviously, the vernal equinox is not the beginning of spring, these are two different solar terms.Beginning of Spring is the first solar term in spring and also the first solar term in the 24 solar terms, and the vernal equinox is the fourth solar term in the 24 solar terms.The specific differences are as follows:

1.Different meanings:

Lichun:"The Collection of Seventy-two Hours of the Moon Order":"Lichun is the first lunar month festival; Li is the beginning of the establishment; the Qi of the five elements goes here and the one that comes back continues here; and the Qi of spring trees begins to arrive, so it is called Li." ; Lixia, Autumn and Winter are the same."

Vernal Equinox:"The Collection of Seventy-two Hours of the Moon Order":"In February, the division is half, and this is the half of ninety days, so it is called division.Autumn has the same meaning." "Spring and Autumn Fanlu · Yin and Yang "In and out of the first and second chapters" said:"The vernal equinox has half of yin and yang, so the day and night are equal and the cold and heat are flat."

2.The time is different:

The beginning of spring:February 3-5 in the Gregorian calendar

Vernal equinox:March 19th or 20th or 21st or 22nd every year

Every year around March 20 in the Gregorian calendar, when the sun is at 0° of the yellow longitude (the vernal equinox), it is the vernal equinox.On this day, the sun almost directly shines on the equator of the earth, and the length of day and night is almost equal in all parts of the world (regardless of the refraction of sunlight by the atmosphere and the shadow of morning and evening).After the vernal equinox, the point of direct sunlight continues to move from the equator to the northern hemisphere, and the days in the northern hemisphere begin to be longer and the nights shorter, that is, the days are longer than the nights in a day; the days and nights are longer in the southern hemisphere, that is, the days are shorter than the nights in a day.Therefore, the vernal equinox is also called the rising point.

3.The climate is different:

Lichun:Lichun is not only the first solar term in the 24 solar terms of the Ganzhi calendar, but also in nature and in people’s minds, spring means the wind and the sun are warm, the birds are singing and the flowers are fragrant, and it also means the growth of all things, spring plowing and sowing, The so-called "a year’s plan lies in spring".In climatology, spring refers to the period of climatology (5 days as a climatology) with an average temperature of 10°C to 22°C.At the beginning of spring, people obviously feel that the days are longer and the sun is warmer.Temperature, sunshine, rainfall, which are often at the turning point of the year, tend to rise or increase.

Vernal equinox:During the vernal equinox, except for the alpine mountainous areas where it is winter all year round and the areas north of 45° north latitude, the average daily temperature in all parts of China rises steadily above 0°C.At this time, the severe cold has passed, and the temperature rises rapidly, especially in North China and the Huanghuai Plain.The daily average temperature rises above 10℃ almost at the same time as the rainy Jiangnan area, and enters the bright spring.On the vast land, willows are green on the banks, warblers are flying and grasses are growing, wheat is jointing, rape blossoms are fragrant, peaches are red, plums are white and spring is yellow, and southern China is a scene of late spring.From the perspective of climate law, the precipitation in the south of the Yangtze River increased rapidly at this time, entering the spring "peach blossom flood" period; in the northeast, north China and northwest regions where "spring rain is as expensive as oil", precipitation is still very little, and the threat of spring drought is the key to agricultural production.main problem.

4.Different points of direct sunlight:

Beginning of Spring:

Between 23.5 degrees north and south latitude, the sun shines directly twice a year; at 23.5 degrees north and south latitude, the sun shines directly once a year.

About the point of direct sunlight, take Lixia as an example, the sun directly shines on the ecliptic at 45°, because sinx=sink sint, where k=23°26′, t=45°, from which x=-16°20′ , and then the direct point of Lixia and Liqiu is 16°20′S, and the point of Lichun and Lidong is 16°20′N.

Vernal Equinox:

The vernal equinox refers to the node of the sun on the yellow equator from south to north.Seen from the earth, the sun moves counterclockwise along the ecliptic.The ecliptic and the equator have two intersection points 180° apart on the celestial sphere.The point where the sun passes the celestial equator from south to north along the ecliptic is called the vernal equinox.Another point 180° apart from the vernal equinox is called the autumnal equinox.After the winter solstice, the point of direct sunlight moves from south to north and passes through this point on the day of the vernal equinox.The sun passes through the vernal and autumnal equinoxes (around March 21) and autumnal equinoxes (around September 23) each year, respectively.

The sun moves from south to north on the celestial sphere and runs to the intersection of the celestial equator and the ecliptic.At this time, it is called the vernal equinox, which is the midpoint of spring in the northern hemisphere.).The vernal equinox occurs around March 20 or March 21, when the day and night are equal in length, so it is called "fen".Simply put; the vernal equinoxes and the autumnal equinoxes are the moments when the sun shines directly on the earth’s equator.

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