Sunday's supermoon will technically be a perigee full moon, the closest full moon of the year, NASA says.

CNN: Rare supermoon eclipse comes Sunday

Petro explained that the combination of a supermoon and eclipse happening at the same time is just planetary dynamics.

CNN: Rare supermoon eclipse comes Sunday

But the last time a supermoon eclipse occurred was in 1982, making Sunday's rare event worth staying up past bedtime.

CNN: Rare supermoon eclipse comes Sunday

"When the rhythms line up, you might get three to four eclipses in a row or a supermoon and an eclipse happening, " he said.

CNN: Rare supermoon eclipse comes Sunday

It's also the first time in more than 30 years that a supermoon and a total lunar eclipse are happening on the same day.

CNN: Best way to see supermoon? On a Chinese moon-viewing flight

This year's September 27 marks three important lunar events -- a supermoon, a total lunar eclipse and Asia's Mid-Autumn Festival, also known as the Moon Festival.

CNN: Best way to see supermoon? On a Chinese moon-viewing flight

While the supermoon is expected to outshine the fainter Eta Aquarid meteors, NASA meteor expert Bill Cooke predicts that some bright fireballs may be visible.

MSN: How to see the supermoon �� and shooting stars, too