As a result, the moon appears to be up to 14 percent larger and 30 percent brighter during a supermoon.
According to a press release issued by Poornaprajna Amateur Astronomers' Club Co-ordinator Dr A P Bhat, supermoons happen when a full moon approximately coincides with a moon's perigee or a point in its elliptical orbit at which it is closest to earth.
According to Earthsky, this day the moon will appear 30% brighter and 14% bigger than usual.
When the moon is passing close to the earth, is is called "perigee". That means that this will be a Super Frost Moon! Closer to eight o'clock in the evening of 3 December, the Moon will approach the minimum distance, and then will gradually be removed. The Dec. 3 Full Cold Moon will be 2017's only "supermoon".
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And even though the moon isn't completely full until Sunday, viewers won't notice a difference on Saturday night.
Supermoons are squishy because there's no official astronomical definition of the term.
However, December's full moon is the only visible supermoon.
And this will be a particularly bright supermoon for the United States, thanks to the more intense sunlight that reflects off the moon in winter, NASA said.
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If you can only catch one episode of the supermoon trilogy, catch the third one. This is because the previous two were around the time of a new moon, which isn't visible in the sky.
"We're seeing all of the Earth's sunrises and sunsets at that moment reflected from the surface of the Moon", says Sarah Noble, a Program Scientist at NASA headquarters.
It'll be full again on Sunday night, but you'll have to be more patient trying to get a good look at it.
Stargazers are in for a treat when the first and only visible supermoon of the year lights up our skies this weekend - and here is when you'll be able to see it in South Yorkshire.
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"Often I find when the moon is near the horizon I have a better chance of incorporating it with a landmark or person, but there are no rules and sometimes a tall object such as the Washington Monument here in D.C. can be used when the moon is at a very high angle".