A supermoon, left, can appear 14 percent larger than a micro moon, at right. (NASA)
At perigee (or when the moon is closest in its orbit), the moon is about 31,000 miles closer to Earth than at apogee (when it is the farthest away), according to NASA.
The moon's nearness will make it appear 14 percent larger and 30 percent brighter in the sky than a full moon at its farthest point from Earth, according to NASA.
When will be the best time to see it?
Sunday's supermoon will also coincide with a total lunar eclipse that will be visible across most of the United States. (For those with clear skies, at least.)
Here are the times to know for prime skywatching:
*The moon will rise around 6:30 p.m. CDT Sunday in Alabama and hit peak fullness at 9:50 p.m.
*The lunar eclipse will begin at 8:07 p.m. CDT.
*The total eclipse will begin at 9:11 p.m. CDT.
*The moment of greatest eclipse will be at 9:47 p.m. CDT.
*The total eclipse ends 10:23 p.m. CDT.
*The partial eclipse ends 11:27 p.m. CDT
*The moon will set between 7-7:15 a.m. CDT on Monday.
On the East Coast, "The moon enters Earth's full shadow, called the umbra, starting at 9:07 p.m. EDT (6:07 p.m. PDT). The total eclipse begins at 10:11 p.m. EDT (7:11 p.m. PDT). Totality lasts an hour and 12 minutes, at which point a bright sliver of the moon will emerge and grow," according to livescience.com.
On the west coast, Californians can start watching when the moon rises at around 7 p.m. Pacific Time. The total lunar eclipse starts at 7:11 p.m. and ends at 8:23 p.m.
Although Sunday's moon will be the closest one to Earth, it will also appear full for the next few nights as well.
The last total lunar eclipse visible in the United States was not long ago: April 4. Those on the West Coast got the best view.
The next total lunar eclipse that will be visible in the United States will be on Jan. 31, 2018, and will be best seen in the western U.S.