It only happens once every twenty years.  The so-called  "Super Moon' effect where the moon appears to be significantly brighter and larger.  Photographers and romantics get ready.  Saturday is Super Moon night.

The moon appears 14% bigger and 30% brighter at its closest point, called perigee, than its farthest point, apogee, along its oval-shaped orbit, NASA scientists say.

The last time a full moon and perigee happened at the same time it was 1983."

Scientist suggest checking the eastern sky at sunset, to also get the benefit of the "moon illusion" -- when the horizon further amplifies the moon's appearance.

"If you want to see the moon looking its largest, by all means look at it when it's close the horizon,"  said David L. DeBruyn, curator emeritus of the Roger B. Chaffee Planetarium in Grand Rapids.