The relationship between astronomical ecliptic season and ecliptic.

You should understand that the tilt of the earth leads to the changes of the four seasons. The ecliptic is the great circle where the earth's orbital plane around the sun intersects the celestial sphere. Because the earth's rotation axis is not perpendicular to the orbital plane, and the equatorial plane is not parallel to the ecliptic, it has an included angle of 23 26', which is called the ecliptic angle, that is, the inclination of the earth's axis leads to the changes of the four seasons.