> Note that the eye can be arbitrarily large or small and the magnitude of the wind surrounding it is irrelevant.
Given that the eye can be arbitrarily small, I would accept the statement that the earth would always have at least one circular wind pattern. The paragraph is not talking about just hurricane size.
Hopefully that won't last too long, or all the air on the planet will end up at point two! (A constant amount of non-compressible air was assumed in the example.)
Given that the eye can be arbitrarily small, I would accept the statement that the earth would always have at least one circular wind pattern. The paragraph is not talking about just hurricane size.