The term 'supermoon' was first coined by astrologer Richard Nolle in 1979, describing a new or full moon occurring at 90% of its closest approach to Earth.
Full supermoons are the biggest and brightest full moons of the year, appearing approximately 30% brighter and 14% larger than usual, although this is hard to spot with the naked eye.
The moon illusion makes the moon look larger when near the horizon than when it is high in the sky. This is a perception trick of the brain.
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