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A rare Blue Moon will light up the night sky on Halloween

Skygazers are in for a treat this weekend, with a rare lunar event taking place – so make sure you mark it in your diary.

October’s second full moon will take place on Saturday – which just so happens to be Halloween, which falls on October 31 annually.

It’s going to be a rare Blue Moon – so you don’t ant to miss it.

Before you get too excited, that doesn’t actually refer to the colour of the moon, but the fact that there are two full moons in one month.

NASA explained: “According to modern folklore, a Blue Moon is the second full moon in a calendar month. Usually months have only one full moon, but occasionally a second one sneaks in.

“Full moons are separated by 29 days, while most months are 30 or 31 days long; so it is possible to fit two full moons in a single month. This happens every two and a half years, on average.”

A Blue Moon usually happens every two to three years, and the next one will appear on August 31 2023.

But although the Blue Moons arrive fairly regularly, one taking place on the scariest night of the year only occur every 19 years.

But this Halloween Blue Moon is rarer still, as it’s also a mini moon.

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A mini moon is the exact opposite of a supermoon, which can appear bigger and brighter in the sky than usual.

That means the Blue Moon will appear smaller and slightly dimmer as it rises on the Halloween sky.

The Halloween full moon 2020 will reach peak illumination at 2.51pm GMT.

However, it will be easier to see when the sun goes down and it gets dark.

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Luckily, the Halloween Blue Moon will be visible from most places in the world, including North and South America, Africa, Europe and much of Asia.

Weather permitting, it will be visible all evening from the UK.

And even though it is smaller than usual, you won’t need any special equipment to see it.

Astronomy educator Jeffrey Hunt told CNET: “Walk outside, and take a look.”.

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