The second full moon is making its back into the night skies this July 31. The blue moon, which is the 2nd full moon in a month, will be seen just after moon set, in the morning of July 31st, the first one was on July 1 which was known as Full Buck Moon and as of AL.com; the full moons of July can sometimes be called as Thunder moon as summertime would usually bring thunderstorms. Though the moon dose not literally turns blue, it pertains to the occurrence of the second full moon which appears on a single calendar month, which is a very rare occasion hence, the expression "once in a blue moon is derived.
The July 31st Blue moon is actually the first Blue Moon experience after 3 years, the last one occurred 2012 and the next would show up until 2018. What makes it rare is that it's occurrence may be seasonal, as per the report of The Weather Network, while our calendar months can only last up 28 to 31 days depending on the month and the year, "a lunar month - the time between reaching the same phase, Full to Full, New to New, etc - is always 29.53 days. "As stated in the news article. It was then explained that " The difference not only throws off when different lunar phases happen from month to month, but the timing of full moons and even how many full moons during a year changes over time. It's not often when that 29.53 day lunar month happens to squeeze into one of our calendar months, though. It takes a while for everything to line up properly."
As per NASA there are instances that the moon does look blue, it is when smoke particles form forest fires and volcanic-ash particles get lifted up into the sky, in which particles of this size (a micron) then scatter red lights stronger than other regular wavelengths, which allows the blue to pass through, and makes the Moon look blue after is shines through these tiny layers.
