A supermoon occurs when the Moon's orbit is closest (perigee) to Earth at the same time the Moon is full, Nasa states. It gives the Moon a slightly fuller appearance, around 2 per cent larger than the average full moon.
The extremes are greater due to the difference in the gravitational pull of the Moon across Earth's diameter. When the Moon is close, Earth's diameter is a slightly larger fraction of the Earth-Moon separation.
High tides and low tides will be more extreme with a perigean full moon and more so for an extreme perigean full moon.
The supermoon will be visible from the night of Tuesday, September 17, into the morning of Wednesday, September 18.
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