In 2021, the autumn equinox occurs on September 22. The fall equinox usually falls between September 21 and 24 each year. In the Northern Hemisphere, the September equinox marks the beginning of fall in astronomical terms. While most Harvest moons tend to occur in September, on some occasions, this name is given to a full moon in October, depending on how the lunar cycle lines up with the Gregorian calendar.ĭuring the Northern Hemisphere's fall equinox, the Earth's axis, which is tilted at an angle of around 23.4 degrees relative to the plane of its orbit around the sun, is pointed neither towards nor away from the sun.Īt this time, the sun shines directly over Earth's equator, and the length of day and night is roughly equal. The term "Harvest Moon" is different from other traditional full moon names, which are each associated with a specific month. In the Northern Hemisphere, the full moon that appears closest to the fall equinox is traditionally referred to as the "Harvest Moon." EDT on September 20.īut to most casual observers, the moon will appear fully illuminated in the night sky from Sunday through Tuesday. For the upcoming Harvest Moon, for example, this moment occurs at 7:54 p.m. Technically, the moon is full for just a single moment. Beautiful Perseid Meteor Shower Photos Show Spectacular Skygazing Event.Hubble Snaps Incredible Photo of Star Cluster in Neighboring Galaxy.Unique 'Failed Star' Is Like Nothing Else in the Milky Way, Study Finds.
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