To make matters more interesting, the reddish, eclipsing moon will be in “perigee” phase – which means it is closest to the Earth for September, and in fact, it is the closest point all year – what some call a “supermoon.” A so-called supermoon appears 14 percent bigger and 30 percent brighter than when the moon is farthest away from Earth.
“There’s no physical difference in the moon,” explains Noah Petro, a NASA scientist. “It just appears slightly bigger in the sky. It’s not dramatic, but it does look larger.”
The coincidence of a supermoon and lunar eclipse is a rare one. It last occurred 33 years ago, and won’t happen again for 18 more.
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