The supermoon tends to be brighter and appear to be larger than its usual size.
A supermoon occurs when a full or new moon coincides with the lunar orb being particularly close to earth in its cycle.
Unusual astronomical phenomenon called the Supermoon, or perigee moon.The orbit of the moon around the Earth in form is not a ideal circle, and a few stretches. That kind of full moon won't be seen again from Earth until 2034, according to NASA.
On Saturday, the distance between the earth and moon was 3,57,492 km.
In the night of 4 December, the Moon will approach earth at a minimum distance for the first time in 6 years 362 thousand. Hence, for those in the Northern hemisphere, it is a cold supermoon.
After 11 months without a supermoon - that's actually just a popular nickname, not an astronomical term - the moon will light up the sky Sunday and again on January 2 and 31.
Supermoon 2017: How to see it in Chicago Sunday
An unprecedented display of astronomical showmanship will light up the night sky this weekend when the supermoon approaches Earth. Last year's supermoon was the closest the moon was to Earth since 1948 and it's not expected to be that close again until 2034.
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Supermoons are squishy because there's no official astronomical definition of the term.
If you miss this year's supermoon, don't worry. This is known as the moon illusion and the moon hasn't grown; it's a trick your eyes are playing on you.
"The supermoons are a great opportunity for people to start looking at the moon", said Noah Petro, a research scientist from NASA's Goddard Space Flight Center. It appears the biggest and brightest during this time because of a "moon illusion" effect, which is created when you're able to compare the moon to other objects for scale.
The first and last "Supermoon" of 2017 will be visible in the sky this weekend.
Considering that a full moon can be covered with a fingernail, even a 7% larger moon may not look that much bigger.
"The supermoon is a 16-inch pizza compared with a 15-inch pizza", he says.