A rare super blue moon will appear over the UK on Thursday night, treating stargazers to a phenomenon that will only happen once this year.Unlike its name suggests, a blue moon is not named after the colour and instead refers to the second full moon in one calendar month.Most months only have one full moon, so a second is quite a rare event, occurring approximately once every two or three years.

A rare super blue moon will appear over the UK on Thursday night, treating stargazers to a phenomenon that will only happen once this year.Unlike its name suggests, a blue moon is not named after the colour and instead refers to the second full moon in one calendar month.Most months only have one full moon, so a second is quite a rare event, occurring approximately once every two or three years.