A supermoon is a full moon, but a full moon is not necessarily a supermoon.
The last supermoon occurred approximately a year ago on December 14. This is because it's a Supermoon, which is a full moon that's closer to the Earth than normal.
The moon will be roughly 10,000 miles closer to Earth on Sunday evening, creating our first and only Supermoon of the year. The Moon's orbit around our planet is tilted so it usually falls above or below the shadow of the Earth.
While scientists argue about the influence of the close passing of Earth's natural satellite for geophysical processes, the Moon is inexorably approaching and promises to be an interesting phenomenon for all the earthlings who are lucky enough to see this spectacle. That means during each month the moon is sometimes passing closer to the earth than others.
The supermoon tends to be brighter and appear to be larger than its usual size.
In the United Kingdom, the supermoon will reach the peak of its full phase at 3.47pm on 3 December, according to the Met Office.
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The first - and final - supermoon of 2017 will begin around 8 p.m. Sunday and reach its perigee at 3:45 a.m. Monday.
If you aren't able to observe this weekend's supermoon, don't worry: The new year kicks off with two supermoons straight from the gate.
When's the best time to view the supermoon?This effect is termed as "moon illusion".
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.
The January 31 supermoon will also be the second full Moon of the month.
"The supermoon gets headlines because the moon's a little bigger and a little brighter, but people get frustrated that they can't always tell the difference".
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