The Moon doesn’t revolve across the Earth in an ideal circle however its orbit is egg-shaped, elliptical. Therefore its distance from the Earth will not be at all times the identical.
At its closest level – or perigee – the Moon is about 220,000 miles from Earth, whereas at its farthest level – or apogee – it’s about 250,000 miles away.
If the Moon is full at its closest level to Earth, or inside 90% of its perigee, it might be referred to as a 'supermoon'.
The time period was first coined by astrologer Richard Noll in 1979 to explain a full moon that seems considerably bigger and brighter because it coincides with perigee.
they could appear to be 14% bigger and 30% brighter than different full moons, exterior,
November's Beaver Moon would be the closest full moon to Earth this 12 months, so will probably be the brightest and seem largest.
With inputs from BBC