How do we know the sun rotates?

A) Both sides are red-shifted.
B) Because the earth rotates.
C) Both sides are blue-shifted.
D) One side is blue-shifted and the other side is red-shifted.

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javoak javoak · Answer 1 · 2019-11-07T21:45:49+01:00

D because it could be dark in the UK and it could be light in the US and there would not be no other way for that to happen.

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topeadeniran2 topeadeniran2 · Answer 2 · 2021-09-28T14:04:31+02:00

We know that the sun rotates because one side is blue-shifted and the other side is red-shifted.

It should be noted that the sun rotates once every 27 days on its axis. It should be noted that when the sun is moving away from someone, there's a redshift which means that the light has a longer wavelength.

On the other hand, when someone is looking at the sun when it's approaching, there'll be a shorter wavelength and this implies a blueshift.

Due to the fact that the Earth rotates from west to east on its axis, the sun appears across the sky from east to west.

In conclusion, the correct option is D.

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