posted by Janae .
Astronomers find that light emitted by a particular element at one edge of the Sun has a slightly higher frequency than light from that element at the opposite edge. What do these measurements tell us about the Sun’s motion?
It indicates the sun rotates, so the side rotating away from us is moving more slowly (relative to us) than the side rotating towards us.
Of course, a tiny part of the shift is due to our revolving around the sun, but that doesn't count much.
thank you, is this related to the doppler effect
It is exactly the Doppler effect.