The degrees of the sun's longitude and compass

The longitude of the ecliptic refers to the longitude in celestial coordinate system. It is the coordinate value used to determine the position of celestial bodies on the celestial sphere in the ecliptic coordinate system, measured from vernal equinox to the east. In this system, the celestial sphere is divided into two hemispheres by its equatorial plane. The ancients called the annual apparent motion line of the sun (that is, the reflection of the earth's orbit on the celestial sphere) the ecliptic, and the ecliptic is the measurement coordinate (longitude) on the ecliptic. The current twenty-four solar terms are divided into 24 equal parts according to the degree of the yellow meridian, and each equal part is 15, which is a solar term.