If you’re a fan of stargazing, make sure you book this Saturday off in your diary.
That night – which also happens to be Halloween – a rare blue moon is set to appear, and you don’t want to miss it!
Blue moons usually only come every two or three years, with the next not appearing until 31 August 2023.
Contrary to popular belief, a blue moon has nothing to do with the colour of the moon. Instead, it’s all to do with the timing of full moons during the year.
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.”
The Halloween blue moon will be visible from most areas around the world, including North and South America, Africa, all of Europe and much of Asia.
Thankfully, the blue moon will be visible all evening from the UK, and you don’t need any special equipment to see it.
Speaking to CNET, astronomy educator Jeffrey Hunt said: “Walk outside, and take a look.”
However, taking a photo of the blue moon isn’t as easy as you might expect.
Mr Hunt added: “When the moon is photographed with a smartphone the results can be disappointing. A telephoto attachment will help make the moon larger.”
If you miss the Halloween Blue Moon, unfortunately you’ve got a while to wait until the next one.
The next blue moons are set to appear on 31 August 2023, 31 May 2026 and 31 December 2028.