According to internet media:scientist: 'Supermoon' Will Be Biggest Moon You'll Ever See
The moon orbits the Earth every 29-1/2 days, so it reaches perigee more than once a month. The orbit of the moon changes slightly over time, so the distance between Earth and the moon also changes -- but only slightly, Williams said.
Tonight, it will probably be only about half a percent closer than it ever is every 18 years, he said, which is a "very, very small amount."
Even this super-close full moon will still be 221,567 miles away, according to NASA.
And though the gravitational effect of the moon causes tides (when the moon is closer, the tides are slightly larger), he said there's "no scientific reason whatsoever" to expect that this supermoon will result in floods or other extreme conditions.
It's likely that the moon won't even look that different to the human eye (although scientists say the moon looks larger when it's closer to the horizon). Still, Williams recommended that you make the extra effort to take a look.
"This is the biggest full moon that you will ever see," he said. "You will see this moon again, but this is as big as it gets."
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