Native American tribes named it this because they would harvest strawberries during this time.
A supermoon is when the full moon looks bigger and brighter in the sky than normal because it's closest to the Earth in its orbit than most other times.
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Astronomer Jake Foster, from the Royal Observatory in Greenwich, London, says the best way to see it will be to look south-east just after sunset.
He says: "The moon will make its way west throughout the night before setting in the southwest just after sunrise.
"You don't need any special equipment to observe this event and there is no particular location you need to be to see it - as this is a bright full moon, as long as the skies are clear of clouds, it will be easy to spot whether you are in a light-polluted city or a dark area of countryside."