What does gold 15 mean?

The longitude of the ecliptic refers to the longitude of the sun or the longitude of the celestial sphere, which is the coordinate value used to determine the position of the celestial body on the celestial sphere in the ecliptic coordinate system (the other value is the latitude of the ecliptic). In this system, the celestial sphere is divided into two hemispheres by the ecliptic plane. When the sun moves to longitude 3 15 degrees, it is the beginning of spring.

The earth revolves around the sun for about 365 days and 5 hours, with a journey of 940 million kilometers. This orbit is called the ecliptic of the sun.

The ancients in China divided 360 degrees into 24 equal parts, each equal part is 15 degrees, which is a solar term. The number of days between two solar terms is about 15 days, that is, there are 24 solar terms throughout the year.

The solar ecliptic in the twenty-four solar terms is as follows:

Spring: 3 15 degrees in beginning of spring, 330 degrees in rain, 345 degrees in fright, 360 degrees in vernal equinox, 30 degrees in Qingming 15 degrees in Grain Rain.

Summer: 45 degrees in the long summer, 60 degrees in the small summer, 75 degrees in the awn grass, 90 degrees in the summer solstice, 0/05 degrees in the hot summer/kloc, 0/20 degrees in the hot summer/kloc.

Autumn: beginning of autumn 135 degrees, summer 150 degrees, Millennium 165 degrees, autumnal equinox 180 degrees, cold dew 195 degrees, and first frost 2 10 degrees.

Winter: 225 degrees in early winter, 240 degrees in light snow, 255 degrees in heavy snow, 270 degrees in winter solstice, 285 degrees in slight cold and 300 degrees in severe cold.