According to the online content article about days and night on earth why does the length of a day change throughout the year

Because the way the earth rotates on its axis and around the sun yearly which relates to why we have season when we have spring its getting close to the sun when we have summer its closest to the sun and when we have fall were leaving the sun and when we have winter its far from the sun but throughout the year daily we still get the ray of the sun for light.