What is the Sun's equatorial rotation period in Earth days?

The Sun's equatorial sidereal rotation period is about 24.47 Earth days. This is the time required for a feature at the Sun's equator to complete one rotation relative to distant stars.

The Sun does not rotate as a solid body. Its surface is made of electrically charged plasma, so different latitudes rotate at different speeds. The equator turns fastest, while regions nearer the poles take longer—roughly 30 to 35 days depending on latitude and measurement method. This behavior is called differential rotation and helps drive the solar dynamo that produces sunspots and magnetic activity.

A common source of confusion is the roughly 27-day figure. That value usually refers to a synodic or Carrington rotation as viewed from Earth, where Earth's own orbital motion affects the apparent timing. The Sun's equatorial sidereal period is shorter because it is measured against the distant background of stars.

Rotation periods can also vary slightly depending on whether astronomers track sunspots, surface flows, or internal layers using helioseismology.