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There’s a Harvest Moon on the rise

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One of the year’s best-known full moons graces the sky this weekend, with the Harvest Moon reaching peak illumination on Saturday.

The 2026 Harvest Moon will be full at 12:49 p.m. Eastern on Saturday, Sept. 26, according to The Old Farmer’s Almanac. Although the precise moment occurs during daylight hours, the moon will appear full for about three days, providing good viewing opportunities Friday through Sunday if skies are clear.

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Unlike many traditional full moon names, the Harvest Moon is defined by its relationship to the seasons. It is the full moon occurring closest to the autumnal equinox. Most years, including 2026, it occurs in September, but occasionally the designation goes to an October full moon.

The name comes from the moon’s historical usefulness to farmers during the fall harvest. Around the time of the Harvest Moon, the moon rises relatively soon after sunset for several consecutive evenings, providing additional natural light during a time when crops traditionally were being gathered.

Ordinarily, the moon rises about 50 minutes later each successive day. Around the Harvest Moon, however, that difference is considerably smaller. Across much of the northern United States, moonrise occurs only about 25 to 30 minutes later from one night to the next.

The effect occurs because of the shallow angle the moon’s orbital path makes with the eastern horizon near the beginning of autumn. That geometry causes the moon to rise at nearly the same time for several nights around the full moon.

The Harvest Moon can also appear particularly large and orange when it is near the horizon, although that appearance is not unique to this particular full moon. Its low position causes moonlight to travel through more of Earth’s atmosphere, while the familiar “moon illusion” can make it seem larger when seen near trees, buildings, or other objects.

The Harvest Moon has long held cultural significance beyond its agricultural origins. In Chinese tradition, the full moon is associated with the Mid-Autumn Festival, celebrated with gatherings, festivities and mooncakes.

Source: The Old Farmer’s Almanac

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