Let’s set the record straight about the Harvest Moon . It’s not bigger than other full Moons. It’s not brighter. So why is it special? That’s the question for October 1 this year, and through the weekend!
Sure, in January you may hear things like, “Look for the full Wolf Moon this weekend!” But is that really the name of the January full Moon? It was, to Anglo-Saxons. But the Lakota Sioux would have retorted, “Nonsense! It’s not the ‘Wolf Moon.’ It’s the ‘Moon of Frost on the Teepee’!” To which the Cheyenne would have said, “You’re both wrong. It’s the ‘Hoop and Stick Game Moon’!”
So any reference that tries to definitively call any particular month’s full Moon by some specific name is choosing to adopt the traditions of some particular group of people and ignore all of the others. Except these two: the Harvest and the Hunter’s.
The Harvest Moon Definition
Astronomically, the Harvest Moon is the full Moon closest to the autumnal equinox (and things really are being harvested right around now).
So, the Harvest Moon isn’t always in the same month. It can fall in September or October. This year, it’s on October 1.
Why the Harvest Moon Shines On
Why does it seem as though there are several full Moons night after night?
- First, note that a full Moon near the autumn equinox rises closer to the time of sunset, so there’s not much time between sunset and moonrise.
- Second, the Harvest Moon rises only 20 or 25 minutes later each night. Typically, the full Moon rises about one hour later each night.
Give this, the full Moon will appear to rise during or near twilight for several days before and after the full Moon. See your local Moonrise times.
It will seem like there are several full Moons – for a few nights in a row – around the time of the Harvest Moon.
You can’t get rid of this full Moon! It’s the relative who came for dinner.
You can see why this is called the Harvest Moon, too. Just when the farmer runs out of daylight to finish the harvesting chores, the full or nearly full Moon shines down from the sky night after night to help out with extra light. This doesn’t happen at any other time.
It’s the polar opposite of the full Moons of February, March, and April. Then, you’ll see moonrise at sunset on one night, but wham!—there’s a 1½ hour delay until the next night’s moonrise. And another 1½ hour delay the night after that. Result: A rising 7:00 p.m. full Moon is followed, just 2 nights later, by the absence of moonlight until 10:00 p.m.
The bottom line—and the whole point of this, of which relatively few people are aware—is that the Harvest Moon is an effect rather than a visual oddity.
The Harvest Moon is a study in lunar behavior, not appearance.
Read more about why this all happens in “Shine On, Harvest Moon!”