Supermoon 

What is a Supermoon?

Supermoon is the phenomenon whereby the moon appears particularly large in the sky owing to the coincidence of its closest approach to the earth (the perigee) with a full (or new) moon.

 

Super Moon Dec. 3. 2017

A supermoon is a full moon or a new moon that approximately coincides with the closest distance that the Moon reaches to Earth in its elliptic orbit, resulting in a larger-than-usual apparent size of the lunar disk as seen from Earth.