gizmo

well the one factor is the earths rotation and the other factor is the orbit is does around the sun. when the rotation changes and the sun rises then it gets warm. when it rotates more then the sun gets low and it becomes cool. when the earth rotates then it changes seasons and then it gets hotter in the summer, as it orbits more then then it becomes winter then it starts getting colder and starts snowing. in conclusion that is two factors of the seasons changing on earth.