What is the phenomenon of the turquoise moon?

The term "blue moon" that science notes is intended for a completely different phenomenon.

The turquoise moon phenomenon in Japan.

Although there is a poetic name, it is only the phenomenon of having a full moon twice a month (usually only 1 time on the 15th day of the lunar calendar). And it's not green either, but it's white as the usual moon.

Usually, each year there are 12 full moon periods corresponding to 12 months. But because the Moon revolves around the earth for 29.5 days, the solar calendar months have 30 or 31 days, so each calendar year is 11 days more than the lunar year.

So after about 2-3 years there will be a lunar year with 13 months, corresponding to 13 times of the full moon. Folk called the 13th time it was "blue moon".

Blue moon taken in Thanh Hoa (2012).(Image source: Wikipedia).

Does the moon ever really turn green?

In the world, people still use the term "blue moon" to refer to the case where the Moon actually turns green. For example, in 1950 - 1951, the people of Sweden and Canada were shown this phenomenon.

At that time, two countries all suffered from huge wildfires, pushing a large amount of smoke into the atmosphere. The molecules in the smoke caused the red and yellow light to disperse, creating a blue color for the Moon.

The moon may turn blue if it is eligible.(illustration).

Volcanic eruptions can also create a blue moon. However, this is an extremely rare phenomenon, because the molecules in smoke and dust need to reach a fairly precise size to create this phenomenon.

Now back to the phenomenon of turquoise moon in Japan. In fact, until now, there has been no official conclusion about the authenticity or the reason that created this phenomenon. Even, there is no guarantee that it is really a moon, or what other objects appear in the sky.

There is also an opinion that this is simply a Lens Flare effect - the phenomenon of glare caused by the camera angle to select the frame with direct light entering the lens.