Final answer:
The rotation of the Earth affects sunlight and causes the seasons.
Step-by-step explanation:
The rotation of the Earth has a significant impact on sunlight, specifically in relation to the seasons. The Earth's axis is tilted by about 23.5°, causing the Northern Hemisphere to be more directly illuminated by the Sun during the summer months and the Southern Hemisphere to be more directly illuminated during the winter months. In September and March, the Earth leans sideways, resulting in equal favoring of both hemispheres with sunlight.