From the archives – AUGUST 19, 2021

Lewiston, ME: On August 22, we greet the full Sturgeon Moon, named by the Native American tribes because sturgeon, a large fish of the Great Lakes and other major bodies of water, were most readily caught during this month.

You may have also this full Moon referred to as a “Blue Moon.” This might be a head-scratcher since most of us are familiar with the definition of a “Blue Moon” as two full Moons occurring in a single month (the second being christened a “Blue Moon”) like we had in On Halloween 2020. But it turns out, that might not be an accurate definition thanks to a decades-old mistake.

There’s another definition of a “Blue Moon” that has to do with the number of full Moons throughout a single season, which is the case this month.

Why “Blue” Moon?

For the longest time, nobody knew exactly why the second full Moon of a calendar month was designated as a “Blue Moon.” One explanation connects it with the word belewe from the Old English, meaning, “to betray.” Perhaps, then, the Moon was belewe because it betrayed the usual perception of one full Moon per month.

In most years, there are twelve full Moons—one for each month, and three for each of the 4 seasons. In 2021, there are 12 full moons, yet four of them occur within the boundaries of our current summer season: June 24th, July 23th, August 22nd, and September 20th. Thus, according to the “Almanac” rule, August’s full Moon, the third of four Moons this summer of 2021, is branded a “Blue Moon.”

When Will The Next Blue Moon Appear?

The following is a list of the Blue Moons that follow the “seasonal” rule (after the August 22 full Moon):1. August 19, 20242. May 20, 20273. August 24, 20294. August 21, 20325. May 22, 2035

The next Blue Moon according to the “two-in-one-month” definition is August 31, 2023.

To Recap

We can have two instances when we can have a “Blue Moon”—one when there are two full Moons in a single calendar month (the definition based on a mistake), and one when there are four full Moons in a single season; the third of which is a Blue Moon.

Does The Moon Really Turn Blue?

On past occasions, usually after vast forest fires or major volcanic eruptions, the Moon has reportedly taken on a bluish or lavender hue. Soot and ash particles propelled high into the Earth’s atmosphere, can sometimes make the Moon appear bluish. But the full Moon of any month or season doesn’t turn blue in color.