It inspires some to stare at the sky for hours.

More scientific minds call it the perigee moon and discuss the distance between Earth and its celestial neighbor.

But on Sunday, many will witness it as the largest of three supermoons this year.

The first was on July 12, and the third and final supermoon of the year can be viewed on Tuesday, Sept. 9.

Normally, supermoons occur about every 13 months and sometimes the phenomenon hits more than once in a year. Last year and this year pile on the astronomic goodness with three consecutive supermoons apiece.

Sunday's supermoon, though, will appear largest to the naked eye, said Bill Krieger, professor of earth sciences and science education at York College.

"It gives us a chance to look up and take our minds off the problems of the world," he said.

The moon, of course, won't be bigger this weekend. It will just be closer, Krieger said.

On average, the moon is 238,000 miles from Earth, but on Sunday it will be about 214,000 miles away, he said.

The phenomenon: Supermoons look bigger because of their position in the sky, according to a NASA report.

A supermoon also appears 30 percent brighter, said Geoff Chester, an astronomer and public affairs officer at the U.S. Naval Observatory in Washington, D.C.

It's an illusion that happens as the moon orbits Earth in a snake pattern. Low-hanging moons look unnaturally large and more luminous, according to the NASA report.

"I guarantee that some folks will think it's the biggest moon they've ever seen if they catch it rising over a distant horizon ..." Chester said.

When the moon's light is coming through Earth's atmosphere at an angle, it's magnified, Krieger said.

"Like other atmospheric phenomena, you'll still need a clear sky and low humidity for the best visibility," he said.

If those conditions are present, onlookers may view one of the closest moons in years, astronomers said.

Many supermoons are about 225,000 miles away, but this one is expected to be about 11,000 miles closer to Earth, Krieger said.

With it will come higher tides and a beautiful night sky, he said.

"Canada will have the best views, but we'll have some nice ones here too," Krieger said.