"That's because in other months, the moon rises about 50 minutes later each day, while the October moon rises just 30 minutes later," National Geographic explains.
National Geographic advises that the best time to see it is as it rises on Sunday evening.
NASA says the term supermoon simply means a "full moon that is closer to Earth than average." It explains why the moon is sometimes closer to Earth in this handy video: "Since the moon's orbit is elliptical, one side (perigee) is about 30,000 miles closer to Earth than the other (apogee)," NASA says.
When perigee-syzygy of the Earth-moon-sun system occurs and the moon is on the opposite side of the Earth from the sun, we get a perigee moon or more commonly, a supermoon." At its closest point this weekend, the full moon will be 222,365 miles from Earth — on average, it's 238,855 miles away, according to National Geographic.
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