What's the difference between beginning of spring and beginning of winter and between the solstice in spring and the solstice in winter?

Our China culture is profound and has a long history. As far as the calendar is concerned, it is a combination of yin and yang. Solar terms such as the beginning of winter and the vernal equinox are determined by the inclination of the solar calendar and the etheric sunlight to the ground. China people are very clever. They set up a stone tablet on the horizontal ground, which is a "ruler" with different scales to the north. This is the standard watch. The exposure angle of the sun to the earth is measured by the shadow length of the standard table at noon every day, because different exposure angles receive different solar radiation heat on the ground, so as to determine the work of farming at different times. The working people in our country regard the periodic change of the standard shadow as the anniversary of the sun. Every change of 15 illumination angle is a solar term. At noon from the winter solstice, the shadow of the standard watch is the longest, and at noon from the summer solstice, the shadow of the standard watch is the shortest, and the shadow of the vernal equinox is as long as that of the autumn equinox. On the autumnal equinox, the sun shines directly on the equator of the earth. As the earth revolves around the sun, the direct surface of the sun moves to the tropic of Capricorn, and the weather is getting colder and colder. When the direct sunlight reaches the Tropic of Capricorn, China will usher in the solar term of winter solstice. On this day, the measuring tool has the longest shadow and receives the least solar radiation heat. Because of the delay between the temperature change and the angle of the sun, the coldest day is not the winter solstice, but the solar term of the great cold.

As the direct surface of the sun moves northward, we have already felt the coming of spring in the northern hemisphere, so the next solar term is beginning of spring. Everything revived in spring, and the working people in China started their work for another year.

These 24 solar terms are

At the vernal equinox, it rained heavily in early spring.

The long summer is full of awns, and the summer solstice is a small summer and a big summer.

Beginning of autumn is in summer, white dew, autumnal equinox, cold dew and first frost.

There is light snow and heavy snow in early winter, and slight cold and severe cold in winter solstice.

2016165438+1October 30th, 24 solar terms were officially listed in UNESCO's Representative List of Intangible Cultural Heritage of Humanity. In the field of international meteorology, the 24 solar terms are known as "the fifth invention of China".

The above calendar is based on the sun, and there is also a calendar based on the moon in China, commonly known as the lunar calendar. Look at our plastic vision of positioning the moon in January. The quantifier is also the moon, which is related to the moon.

The current calendar, the so-called Gregorian calendar, has nothing to do with the sun and the moon, but only with western myths.