ToplineThe moon is expected to reach its closest point to Earth tonight, resulting in the largest supermoon this year, according to experts, an unofficial astronomical phenomenon that occurs up to four times annually.

After a display of the rare Northern Lights and an appearance of a comet that may leave the solar system forever, the year’s largest supermoon completed October’s celestial trifecta.

The full moon falls in the midpoint of the lunar cycle when the Earth is positioned directly between the sun and the moon. The moon takes about 30 days to orbit the Earth, which is the full lunary cycle.