Many claim they can spot the subtle difference between your average full moon and a supermoon even though the truth is that the difference is quite small. The moon is just 14% larger at its perigee, the closest part of its elliptical orbit relative to Earth, than it is at its apogee, the furthest point of its orbit relative to Earth. However, the moon is 30% brighter, which is part of what makes the moon so photogenic during these events.