The Hunter's Moon will reach peak illumination just after midnight on Monday, October 26, setting a spooky mood for Halloween. A full moon occurs when the Earth is positioned between the Sun and Moon, with the Earth-facing side of the Moon fully lit by reflected sunlight. The Hunter's Moon is named for the traditional time of year when people hunted game to prepare for winter. It differs from the Harvest Moon, which is the full moon closest to the fall equinox, occurring in September this year. A Halloween full moon, which also qualifies as a "blue moon" (two full moons in a single month), happens roughly every 19 years, with the next one expected in 2039. Celestial events to anticipate include the Geminids Meteor Shower in December and a "supermoon" for Christmas. To best view the Hunter's Moon, it is recommended to watch it at moonrise on Sunday evening, rather than staying up until its peak illumination time.