The Earth's radius is 6378.1 km. Its average distance from the Sun is 1 AU=149,598,000 km. Because the Earth is tilted, one of its poles will be closer to the sun than the other. The question is "how much closer?". If the Earth was tilted on its side in its orbit so that the North Pole pointed directed to the Sun, how much closer would the North Pole be to the Sun than the South Pole? What percentage of the Earth's total distance from the Sun is this?