Here's why:

* The Earth Revolves Around the Sun: The Earth orbits the Sun in a slightly elliptical path. This revolution takes approximately 365.25 days, causing our year.

* The Sun Rotates: The Sun itself rotates, but it does so on its own axis. The Sun's rotation period is about 25 days at its equator and slightly longer at its poles.

* The Earth's Rotation: The Earth rotates on its own axis, completing one rotation in approximately 24 hours, giving us day and night.

In summary, the Earth revolves around the Sun, and both the Earth and the Sun rotate independently on their own axes.