Here's what you need to know:

* Rotation: The Sun rotates in a counter-clockwise direction when viewed from above the Sun's north pole.

* Differential Rotation: The Sun doesn't rotate as a solid body. Its equator rotates faster than its poles. The equator completes one rotation in about 25 days, while the poles take about 36 days. This is called differential rotation.

* Axis Tilt: The Sun's axis is tilted at an angle of about 7.25 degrees relative to its orbital plane around the Milky Way galaxy.

How we know:

* Sunspots: The movement of sunspots across the Sun's surface reveals its rotation.

* Doppler shifts: The Doppler effect allows astronomers to measure the Sun's rotation speed by observing how the light from different parts of the Sun is shifted.

The Sun's rotation is important for several reasons:

* Solar activity: The Sun's rotation is a key driver of solar activity, like sunspots, solar flares, and coronal mass ejections.

* Shape of the Sun: The Sun's rotation causes it to bulge slightly at the equator and flatten slightly at the poles.

* Solar wind: The Sun's rotation helps create the solar wind, a stream of charged particles that flows outward from the Sun.