Give two methods for determining how fast the sun rotates on its axis. Is the rotation speed the same for?

Question

the entire sun?

Answer 1

1 - Visually, by sighting features on the sun (sunspots, usually), and observing how many days it takes for them to appear in the same area.

2. Using radio waves, the sun gives off many spectrums of radio energy; by finding a particular radio source on the solar surface, and again - waiting for it to return to the approximate same spot as viewed before.

The sun rotates faster at it's poles than at it's equator. It'll rotate about every 28 days on it's equator, but only 24-25 days closer to it's poles.

Answer 2

No since it's a gaseous bdy, the rotational speed varies over latitude.