The sun has 99 percent of the mass of the solar system, but less than 1 percent of the angular momentum. It is spinning too slowly to have formed naturally.
Brown, Walt, 1995. In the Beginning: Compelling evidence for creation and the Flood. Phoenix, AZ: Center for Scientific Creation, p. 19.
Among solar-type stars, there is a strong correlation between age and rotation rate; the younger stars spin more rapidly (Baliunas et al. 1995). This implies some kind of braking mechanism that slows a star’s rotation. A likely candidate is an interaction between the star’s magnetic field and its solar wind (Parker 1965).
So we have a theoretical explanation, braking, and a correlation. Now Phil Plait discusses new evidence supporting the braking model : observations of stars with and without accretion disks show that all that material does seem to slow the rotation of the star down. There are some nice animations, too — the magnetic field of the star is like a big paddle-wheel moving through muck. Very cool.
This is why biologists keep the astronomers around — so they can answer the occasional off the wall questions we get from creationists about stars. And angular momentum. And magnetic fields. You know, all that physics stuff.