Is it the winter solstice when the sun is the first to rise?

The solstice in winter is when the sun's spirit begins to rise.

The ancient book Zunxian Manuscript: When the cathode arrives, the sun begins to grow, and the sun arrives to the south, so the day is short and the shadow is long, so it is called "winter solstice day", also known as "one sun is born". The ancients believed that since the winter of solstice, the sun of heaven and earth began to flourish, representing the beginning of the next cycle, which is a good day.

The solstice in winter, also known as "the birth of a day", is commonly known as "winter festival", "dragon solstice festival" and "sub-year-old" As early as more than 2,500 years ago in the Spring and Autumn Period, China had observed the sun with the earth and determined the winter solstice, which was the earliest of the 24 solar terms.

In the east, the sun runs to 270 degrees of the yellow meridian, and the sun shines directly on the tropic of Capricorn (also known as the winter solstice daily line), and the sun is most biased towards the northern hemisphere. Therefore, the winter solstice is the most "precious" day and the longest night in the northern hemisphere. After the winter solstice, the stars in the night sky are completely replaced by the stars in winter. From today, they will enter the ninth.

Historical origin

China's astrological culture has a long history and is profound. The twenty-four solar terms were originally formulated on the basis of changing stars. In different seasons and at different times, the Big Dipper will point in different directions, that is, "bucket handle points to the East, and the world is spring;" Guide to barrel handle, it's summer in the world; Bucket handle refers to the west, and the world is autumn; The barrel handle refers to the north, and it is winter all over the world. "Twenty-four solar terms" is the product of ancient farming civilization, which is related to the time of dry farming and gossip and has a long history.

During the period of Emperor Wu of the Western Han Dynasty, the "Twenty-four solar terms" were absorbed into the taichu calendar Law as a supplement to guide the agriculture in the northern part of the Central Plains, and the "Twenty-four solar terms" were measured in the Yellow River basin by Tugui's solar shadow measurement method. The current "24 solar terms" are determined according to the position where the sun returns to the ecliptic.

That is, on a 360-degree circle "ecliptic" (the apparent path of the sun on the celestial sphere for one year), the vernal equinox starts at 0 degrees, and every time the sun runs on the ecliptic 15 degrees is a "solar term". In the process of inheritance and development, the 24 solar terms have been incorporated into the lunar calendar and become an important part of the lunar calendar.