October will feature the largest and brightest full moon of the year, occurring on Tuesday, October 7, at 4:48 AM BST (11:48 PM EDT on October 6). This event marks the first supermoon since November 2024 and is also referred to as the ‘Harvest Moon.’
The name Harvest Moon is rooted in agricultural traditions of the Northern Hemisphere and pertains to the full moon closest to the autumnal equinox, which takes place on September 22 or 23 annually. Historically, farmers relied on the light from this moon to assist with harvesting before the introduction of artificial lighting. This year’s Harvest Moon will shine bright on a relatively late date—October 7—making it the latest occurrence since 1987.
A supermoon, a term first introduced in 1979, describes a new or full moon that occurs when it is within 90 percent of its closest approach to Earth (known as perigee). As this supermoon graces the night sky, casual observers will find it particularly prominent.
The phenomenon known as the “Moon Illusion” further enhances the perception of the supermoon as it nears the horizon. Scientists suggest that the size of distant objects, such as trees and buildings, can create an optical illusion, leading our brains to perceive the moon as larger than it actually is. As noted by NASA in a blog post, “Photographs prove that the Moon is the same width near the horizon as when it’s high in the sky, but that’s not what we perceive with our eyes.” Despite being studied for millennia, the exact scientific explanation behind this illusion remains elusive.
In addition, the full moons of November and December will also be classified as supermoons, providing more opportunities for stargazers to witness this fascinating astronomical event. The upcoming full moon coincides with another notable event in the UK on Guy Fawkes Day. If the skies are clear, the Beaver Moon on November 5 will be accompanied by fireworks displays across the nation.
