The photo was taken with a lens at a focal length of 300mm, a shutter speed of 1/200, aperture of f3.5, and ISO 320. Photo: AP

The world witnessed a supermoon on Sunday. A supermoon phenomenon occurs when moon's orbit is closer than average to Earth.The Dec. 3 full moon was the first of three consecutive supermoons. The next two will occur on Jan. 1 and Jan. 31, 2018. A supermoon is a full moon or a new moon that approximately coincides with the closest distance that the moon reaches Earth in its orbit, resulting in a larger-than-usual apparent size of the lunar disk as seen from Earth.