See a Rare Super Blue Moon, Co-Starring Saturn, on August 30

The saying "once in a blue moon" means something that rarely happens. As it turns out, a blue moon, meaning the second full moon in one month, is not extremely rare and is not blue. But even so, our next full moon, which is the "super blue moon" on Wednesday, August 30, is something to write home about. Here's everything to know about this lunar event, including how to spot Saturn while you're out moon gazing.

It's the biggest supermoon of the year.

"Supermoon" has been a buzzword this summer—our last two full moons have been supermoons and September's Harvest Moon will be one too. The term simply means a new or full moon within 90 percent of its closest point to Earth in its orbit. The super blue moon on August 30 will be the closest of all the full supermoons this year at only 222,043 miles away, according to The Old Farmer's Almanac, versus the average 238,855 miles.

The difference in a supermoon's apparent size and brightness is hard to detect visually, but it can amplify the moon illusion, says Space.com—that is, when the moon looks bigger because it appears close to the horizon, trees, or a building.

A supermoon can also intensify the extreme low tides and high tides that occur during full and new moons—so if you're on the coast, beware.

There won't be another "super blue moon" till 2032.

With a lunar cycle of 29.5 days, we're bound to have two full moons in one month (aka, a blue moon) every so often—one usually occurs every two or three years. And full supermoons usually occur three to four times a year, making them pretty common. However, a moon that is both blue and super is a good bit rarer. That last one occurred in December 2009, and the next one will happen in August 2032, according to Time and Date.