Of course, Saturday Moon will not really be blue. And the reason for the name is a bit confusing.
The Blue Month is the second of two full moons per month – but it may also be the third of four full moons in one season. In this case, it's the fourth of the four full moons in the spring. It's not as often as two months a month.
"The name" Blue Moon "has nothing to do with the color of the moon," he said. Gianluca Masi, astrophysicist and virtual telescope project director in Rome, wrote an email. “Every two or three years we have 13 full Moons. In this way, we can have four full Moons or two months a month in a given season. ”
This is the last season of a seasonal blue moon in August. 2021
Very rarely, both types of blue moon occur within one year; this occurs in 2048, including a monthly blue moon in January and a seasonal one in August.
Sometimes the moon in certain sky conditions can actually be blue, but it cannot be predicted.