Hello Cian, there is no difference in meaning between the two. "'Round" is simply a shortened version of around, probably written that way to reflect how people of a certain time and place commonly said it. Hope that helps!

Your answer is really clear. Thank you very much!

you need to say "around the sun" to be correct, however people do say "round the sun" "round" = a shape used in geometry. "around" = to circle around something either in an orbit, or like a prey animal circling around it's prey to deceive the prey into thinking the predator is not getting closer.

Hi Cian I think "the earth goes around the sun" is correct