An auspicious day when the ecliptic intersects with yellow and red.

Generally speaking, there are two definitions of the ecliptic, which are both related and different.

The first definition: the plane on which the earth moves around the sun is called the ecliptic plane, which is centered on the observer and has an infinite radius. The spherical surface on which all celestial bodies project is called the celestial sphere, and the intersection of the ecliptic plane and the celestial sphere is called the ecliptic.

The second definition: the sun draws a big circle on the celestial sphere with a star background every year, and the trajectory of the sun is called the ecliptic.

In fact, "the auspicious day of the ecliptic" is explained in a great sense from the weather forecast. Imagine what will happen to activities such as marriage, funeral, business cooperation, building breaking, business trip, tourism, and even natural disasters? The yellow here refers to the trajectory of the sun, which is not exactly the same as the intersection angle between yellow and red.