This provides extra light and makes it easier for farmers to see what they are doing while harvesting crops. This has it typically appearing with September's full moon, but it can also appear in October, which is this case this year.
Other full moons rise about an hour after sunset but the harvest moon rises just 20 minutes after.
Beyond that, there's not much that differentiates harvest moons from regular moons - beyond the time of year.
"The previous one was in 2009, but the one before that was 2006, and the next one will be in 2020", Ernie Wright, scientist at the NASA Goddard Space Flight Center, told National Geographic.
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This year's autumnal equinox was on September 22, making the October 5 full moon the Harvest Moon - because it is the closest full moon in the calendar.
The reason that it is called a Harvest Moon has to do with farming.
The full Moon, observable to anyone in the northern hemisphere, was clearly visible across much of the United Kingdom thanks to largely clear skies.
In some Native American cultures, the harvest moon is referred to as the travel moon, dying grass moon or blood moon. This effect sometimes occurs when you glimpse the moon when it is close to the horizon.