The primary cause of the day and night is Earth’s rotation on its axis.

Explanation:

Sunrise, sunset, and the day-night cycle (also known as the diurnal cycle) are commonplace for most people in the world. The length of day and night might vary by a few hours as a result of seasonal variations that occur with each passing year. However, the Sun does not set at certain times of the year in other parts of the world (for example, the poles).