Supermoon 2020

A supermoon is a full moon or a new moon that nearly coincides with perigee the closest that the Moon comes to the Earth in its elliptic orbit resulting in a slightly larger-than-usual apparent size of the lunar disk as viewed from Earth. The technical name is a perigee-syzygy (of the Earth-Moon-Sun system) or a full (or new) Moon around perigee. 
The term supermoon is astrological in origin and has no precise astronomical definition.

By- Vineet Maindola from Dehradun, India (Super Moon)

The real association of the Moon with both oceanic and crustal tides has led to claims that the supermoon phenomenon may be associated with increased risk of events like earthquakes and volcanic eruptions, but no such link has been found.

Supermoon comparison

NASA image showing comparison of a supermoon (left) and a micromoon (right)

Supermoons will be the marked points nearest the bottom of the graph.

Of the possible 12 or 13 full (or new) moons each year, usually three or four may be classified as supermoons, as commonly defined.

The most recent full supermoon occurred on May 7, 2020, and the next one will be on March 28, 2021. The one on November 14, 2016, was the closest full supermoon since January 26, 1948, and will not be surpassed until November 25, 2034. The closest full supermoon of the 20st century will occur on December 6, 2052.

The oscillating nature of the distance to the full or new moon is due to the difference between the synodic and anomalistic months. The period of this oscillation is about 14 synodic months, which is close to 15 anomalistic months. So every 14 lunations there is a Full Moon nearest to perigee.

Occasionally, a supermoon coincides with a total lunar eclipse. The most recent occurrence of this was in January 2019, and the next will be in May 2021.

Appearance

While the moon's surface luminance remains the same because it is closer to the earth the illuminance is about 30% brighter than at its farthest point, or apogee. This is due to the inverse square law of light which changes the amount of light received on earth in inverse proportion to the distance from the moon. A supermoon directly overhead could provide up to 0.36 luxA full moon at perigee appears roughly 14% larger in diameter than at apogee. Many observers insist that the moon looks bigger to them. This is likely due to observations shortly after sunset when the moon is near the horizon and the moon illusion is at its most apparent.

The supermoon of March 19, 2011 (right), compared to an average full moon of January 18, 2011 (left), as viewed from Earth By Karen Roe from Bury St Edmunds, Suffolk, UK,

Effects on Earth

Claims that supermoons can cause natural disasters, and the claim of Nolle that supermoons cause "geophysical stress", have been refuted by scientists.

Scientists have confirmed that the combined effect of the Sun and Moon on the Earth's oceans, the tide is greatest when the Moon is either new or full. and that during lunar perigee, the tidal force is somewhat stronger, resulting in perigean spring tides. However, even at its most powerful, this force is still relatively weak, causing tidal differences of inches at most.

Super moon rising

https://youtu.be/vF0w0-xx7YE