Rotation in a cross-section of the Sun, deduced from the analysis of the resonating modes of the Sun (LOWL).
(Figure and text adapted from http://www.obs.aau.dk/helio_outreach/english/engHA5.html)

The colour coding shows the rotation period in days, as indicated on the scale to the right.
A good sign is that we find a surface rotation rate which is very similar to the one that we already knew from observations of features on the solar surface.