On November 14, the Moon will be closer to Earth than it has been this century.
The event is being billed as the 'supermoon to end all supermoons'.
It will be the closest the Moon has been to Earth since 1948. And you don't want to miss this one- another one like it won't occur again until 2034.
Supermoons aren't all that rare - there was one in October and there'll be another on in December. But what makes this moon special is that it becomes full at just about the closest point to Earth in its orbit.
And the November lunar cycle will orbit closer to the Earth than it has in decades, making the moon look enormous and luminous.
It will appear 14% larger and 30 per cent brighter at perigee (the closest point to the earth) than when it is at its furthermost point, apogee (which is about 30,000 miles further away).
It will also be at its fullest about two hours after reaching perigee, making the effect even more pronounced.
The next time a full moon will be this close will be November 2034, and the closest full moon of the century will be in 2052, so mark your diaries.
You may also hear people refer to it as the 'super beaver moon'. That's because supermoons have often been given names according to the season they fall in, and this time of year is when traps for beavers would have been set.
Its most significant impact is likely to be on the tide.