Solar rotation is able to vary with latitude because the Sun is composed of a gaseous plasma. The rate of rotation is observed to be fastest at the equator (latitude φ=0 deg), and to decrease as latitude increases. The differential rotation rate is usually described by the equation shown.
A current set of accepted average values is:
|ω||angular velocity (°/day)|
|A||constant - current set of accepted average values : 14.713 deg/day (± 0.0491) (°/day)|
|B||constant - current set of accepted average values : -2.396 deg/day (± 0.188) (°/day)|
|ϕ||solar latitude (degree)|
|C||constant - current set of accepted average values : -1.787 deg/day (± 0.253) (°/day)|