"Perigee refers to the moon being at its closest distance to the Earth, and syzygy refers to the alignment of multiple bodies - the moon, Earth and sun need to be aligned for us to see a full moon".
The term was coined by an astronomer in 1979, and we've been hearing about it ever since. According to NASA, the December supermoon can look 14 percent bigger and 30 percent brighter as compared to when a full moon is at its remotest point from earth.
On the night of December 3, the sky-watchers across the globe will witness the first and last observable supermoon of 2017. The variations in apparent size and illumination amount to few percent but they can improve the already incredible sight of the full moon, making a supermoon worth looking up for.
December's full moon officially occurs at 10:47 a.m. Sunday.
This supermoon will occur when the moon is about 252,000 miles away from the Earth and will appear 16% brighter and 7% larger.
At that moment, the moon will not be visible over most of North America. "So it translates to the closest separation between the moon and Earth when the Earth, moon and sun are aligned", Besla told NPR. At that point, the moon will be just 222,135 miles from Earth, almost 16,000 miles closer than it normally is throughout the year. The moon should sit near the constellation Taurus, though it shouldn't be hard to spot.
In any case, the best time to see a super-full moon is as soon as the moon "rises" just above the horizon line.
At it's closest point, the moon will pass 222,135 miles from earth. There will be another supermoon on January 2, 2018.
Supermoons do not cause extreme flooding, earthquakes or other natural disasters, NASA says.More news: Telecom regulator backs net neutrality
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