(Did you mean 8.3 minutes?)So where do the 8.3 minutes and 2.1° fit in?I guess it is back to the basics to relieve you from your confused state. It takes about 8.3 seconds for the light to travel from the sun to earth. In that 8.3 seconds the earth rotates approximately 2.1 degrees.
No. I am saying that the component in the change in apparent position due to the earth's rotation is approximately 2.1 degrees.
Now using MINUTES it makes more sense mathmatically!