from space.com: There is more to a "supermoon" than meets the eye.
Science governs the appearance of the largest full moon of the year, and this weekend you can check out the amazing lunar sight for yourself.
On Sunday (June 23), the moon will be at its closest point to Earth — called perigee. This relatively close brush will happen as the moon enters its fullest phase, creating the cosmic coincidence known as the supermoon. At its fullest and closest, the moon will appear about 12 percent larger in the sky.
"It doesn't matter where you are, the full moon you're seeing will be the biggest for 2013," Michelle Thaller, the assistant director of science at NASA's Goddard Space Flight Center said. "… That 12 percent size different can mean as much as a 30 percent change in the brightness, so this will be a particularly bright supermoon."
Related:
Supermoon Sunday: Don't miss tomorrow evening's phenomenon
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