Blue Moon!!!

A blog is like a cocktail party. Don’t be a jerk and talk about yourself all the time. 
Good point. So today, let’s talk about … A blue moon!
We are having an opportunity that we “cannot refuse”. Next one will be back in 2018!
In the 31st of July (this year, 2015) there will be an astronomical event! This year will have 13 full moon instead of usual 12. It has nothing to do with a colour of our satellite. Sometimes it is possible to actually see a blue coloured moon, but it is caused by a particular kind of dust in the atmosphere. Dust or smoke particles must be of a certain size; slightly wider than 0.7 micron. The particles scatter the red light making the Moon appear blue in color, this can happen, for instance, after a dust storm, forest fire or a volcanic eruption.
The Astronomical Blue Moon happen either once every two to three years or so, depending on various methods of calculating. 

It can be a the third full Moon in an astronomical season with 4 full Moons (versus the normal 3), or the second full Moon in a month with two full Moons
The next blue moon will be on the 31st of January 2018. 

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