We're going to see a rare Halloween blue moon tomorrow

We're going to see a rare Halloween blue moon tomorrow

On 31 October at 8:19 PM, the Blue moon will be witnessed in the night sky. The full moon appearing on July 31 is what is called a Blue Moon, which refers to the second of two full moons appearing in the same calendar month.

October's first full moon was the gather moon on October 1, and the second is an rare full Halloween blue hunter's moon.

Victor Arora, Observatory Coordinator at the University of Waterloo said not only will the special moon be visible all night, but Mars will also be easy to spot.

"Any time the moon is technically full on October 31, it will also have to be a blue moon because the lunar cycle is only 29.5 days long", the Farmer's Almanac's website states.

The term "blue moon" evolved to denote something that is absurd, according to Space.com, citing Philip Hiscock, a folklorist at the Memorial University of Newfoundland, in a 2012 article in Sky & Telescope magazine.

Blue Moon was supposed to mean the third full moon in a calendar month where four full moons were expected.

He wrote, "Seven times in 19 years there have been - and still are - 13 full moons a year".

Blue Moons take place once every few years.

The first thing to understand about the Blue Moon is that it won't really look blue!

A rare full moon will be seen for the second time within a month.

But why call it a blue moon?

More confusingly still, full moons in October are generally known as "hunter's moons".

"The moon is our cosmic partner, but it's also a big lightbulb in the sky", she says.

NASA shares that this is also deemed the Hunter's Moon, the full moon that follows the Harvest Moon that appeared on October 1.

Typically, when a moon turns blue, it is caused by smoke or dust particles in the atmosphere, such as during a large volcanic eruption. "This happens each 2.5 to three years, or once in a blue moon". The next seasonal blue moon will come on August 22, 2021.

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