The astronomical term for a supermoon is "perigee syzygy".
A supermoon occurs when the full moon coincides with the moon's perigee- the point of orbit when the moon is closest to earth. You also have the option of seeing the moon live online via Europe's virtual telescope project. Typically, the moon is 238,000 miles from earth. 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.
According to timeanddate.com, the moon will officially reach its fullest point at 8:46 a.m. MT this Sunday December 3. The celestial event will be visible for anyone who is located somewhere without dense cloud cover, marking the final notable moon appearance of the year. More than a year back, on November 14, 2016, an exclusively large supermoon was witnessed by the world.
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Full moons normally occur when the Earth is directly in line between the moon and the sun.
January 2018 will have two full moons on January 2 and 31, both of which are considered super-moons, because the moon will again be near his cellar. Because of this, the gravity of the Sun pulls the fang closer to the Earth.
The supermoon will be visible in night skies around the planet, but the best time to see it will be just after sunset. According to NASA, the moon will be at its nearest distance to Earth - a measly 222,443 miles during this time.
Supermoons do not cause extreme flooding, earthquakes or other natural disasters, NASA says.