When The Supermoon Wowed The World
This month’s highly anticipated “supermoon eclipse” may be a magical treat for skywatchers, but there’s nothing supernatural about the event.
On Sept. 27, skywatchers throughout North and South America, Europe, Africa, western Asia and the eastern Pacific Ocean region will witness a total eclipse that happens to occur when the moon looks abnormally large and bright in Earth’s sky. It will be the first supermoon eclipse since 1982, and the last until 2033.
“When the moon is farthest away, it’s known as apogee, and when it’s closest, it’s known as perigee,” Noah Petro, deputy project scientist for the Lunar Reconnaissance Orbiter at NASA’s Goddard Space Flight Center in Greenbelt, Maryland, said in a statement. “On Sept. 27, we’re going to have a perigee full moon — the closest full moon of the year.”
The moon is about 31,000 miles (50,000 kilometers) closer to Earth at perigee than it is at apogee. As a result, perigee full moons, also known as supermoons, appear about 14 percent bigger and 30 percent brighter in the sky than do apogee full moons (which are also called minimoons).
There’s no physical difference in the moon,“ Petro said. “It just appears slightly bigger in the sky. It’s not dramatic, but it does look larger.”
“Normal” total lunar eclipses — which occur when the Earth, moon and sun align, and the moon passes completely into Earth’s shadow — aren’t terribly uncommon: On average, a skywatcher in a given location on Earth can expect to see one of these events every 2.5 years or so.
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