The term 'Supermoon', coined by astrologer Richard Nolle, essentially means a bigger and brighter full moon. Astronomically known as a perigee moon, the event occurs when a full moon lines up with the Earth and the Sun at a specific point in its orbit, called the lunar perigee.
"The Supermoon will appear up to 14% bigger and 30% brighter than a normal moon. There will be another Supermoon next month, but by then, it will be further away. You won't get another chance to see one like this until August 2014," said N Raghunandan, director, Planetary Society of India.
NASA said there is scant evidence to suggest that it could cause natural calamities.