A so-called ‘supermoon’ is the coincidence of a full moon with the closest approach the Moon gets to the Earth on its elliptical orbit, resulting in its largest size as seen from Earth.
On Monday, November 14, the full moon makes its closest pass to Earth in its orbit and will appear up to 14 percent bigger and 30 percent brighter, making it a supermoon.
This supermoon is especially ‘super’ for two reasons: it is the only supermoon this year to be completely full, and it is the closest moon to Earth since 1948. The moon won’t be this super again until 2034!
It’s a rare thing, really, entire lifetimes may have come and gone without the moon looking quite as large as it will today.