[geezerjay]

> Or as perfect a sphere as one is likely to find in the physical world.

That's precisely the point. One may argue that the sun being a perfect sphere is a fact, but someone else may also point the facy that the surface of the sun shows significant deviations from the perfect sphere, thus the facy being that the sun is not a sphere.

The thing is, they wouldn't be discussing facts but instead personal opinions based on observations. Thus both would be right and wrong while the facts were still the same.