If the Earth spun on an axis that was perfectly perpendicular to the equator, how might this affect latitudinal differences in incoming solar radiation? There would be no latitudinal differences because all points on the Earth would be equidistant from the sun. There would still be latitudinal differences because incoming solar radiation would be spread across a greater area at the poles than at the equator. There would still be latitudinal differences because latitude is not determined by the Earth's position on its axis. There would be no latitudinal difference because the axis of the Earth would be perpendicular to the sun.