In a treat to stargazers, the moon appeared seven per cent larger and 15 per cent brighter on Sunday night, the first in a series of three supermoons. The next two will appear on January 1 and January 31, 2018.
The phenomenon happens when the moon reaches its closest point to earth. This astronomical body that orbits planet earth is known as a perigee moon.
The moon circuits the earth in an elliptical or oval orbit - a supermoon occurs when the perigee moon is also a full moon.
Robert Massey, of the Royal Astronomical Society, said it will appear brightest at midnight - when at its highest point above the horizon.
In 2016, the moon made its closest approach to earth since 1948. It won't be that close again until November 25, 2034.