The Next Supermoon is coming on September 27th.
Here is how The New York Daily News explains it:
A rare cosmic event will take place later this month, when people will witness the total lunar eclipse of a supermoon for the first time in more than 30 years.
The wild occurance, the first since 1982, will take place on Sept. 27 — and won’t happen again until 2033, according to NASA.
A supermoon is when the moon could appear up to 14% larger and up to 30% brighter, because it coincides with its perigree — the point in the lunar orbit when it’s closest to Earth.
During a total lunar eclipse, the moon passes through the Earth’s shadow — which blocks the sunlight reflecting off the moon, making it turn a reddish hue.
You might be interested in The Best Resources About The “Supermoon.”