A blue moon normally occurs once every two years, but in 2018, two blue moons will rise within two months of each other.

What is even more unusual about the January 31 blue moon is that it is coupled with a total lunar eclipse for the first time in more than 150 years.

Tomorrow’s lunar eclipse also marks the end of NASA’s ‘Supermoon Trilogy’ and will take on a reddish hue during the eclipse – hence it is known as the blood moon.

NASA said: “The January 31 full moon is special for three reasons: it’s the third in a series of ‘supermoons’, when the Moon is closer to Earth in its orbit – known as perigee – and about 14 percent brighter than usual.

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