‘Supermoon’: Large Full Moon This Weekend

If the full moon rising in the East struck you as unusually large Saturday night, you would be right. It did loom larger than usual. Though it’s hardly a scientific term, it is what’s known as a “supermoon.”

If the weather is clear where you are, it should be a sight to see. It happens because — despite what our senses tell us — the moon does not orbit us in a perfect circle. It follows a slightly elliptical path every month. At 11:35 p.m. EDT, say astronomers, it will come within 221,802 miles of us — coincidentally about one minute before it’s at its fullest.

The result: When the moon is closest to Earth, it appears 14 percent larger and 30 percent brighter than when it’s farthest from us. Two weeks from now, on the opposite side of its orbit, it will be about 252,000 miles away.

Remember the numbers. They’ll come in handy at the end of this story.

“The full Moon has a reputation for trouble,” wrote Tony Phillips, an astronomer who maintains NASA’s Science News site. “It raises high tides, it makes dogs howl, it wakes you up in the middle of the night with beams of moonlight stealing through drapes.

“If a moonbeam wakes you up on the night of May 5th, you might want to get out of bed and take a look.”

But is there really anything “super” about it, beyond the spectacle? Astronomers say emphatically not. It may increase high tides in places by a few inches, but that’s about it.

For all the folklore about full moons and madness (“lunacy”), social scientists have searched in vain for correlations between the moon and crime rates or admissions to psychiatric institutions.

So if the weather cooperates (check our weather page for a forecast), look outside — fearlessly — and drink in the moonlight. Many people say the best time to look is early evening, just as the moon is coming up over the horizon. You’ll see the moon, pumpkin-colored, slowly rising in the East — and, boy, will it look large.

It is, in fact, no larger in the sky than when it’s overhead, but our minds fool us, perhaps because we have a reference point — something on the horizon — that we lack when it is high among the stars.

“For instance,” said Phillips in an email, “when you see the moon in close proximity to a tree, your brain will miscalculate the distance to the moon, mentally bringing it closer (like the tree) and thus making it bigger. It seems so real, but this beautiful illusion is all in our minds.”

Read more on ABC News.

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