[![A blood moon](https://i.guim.co.uk/img/media/75583fcfe2eb74f1e89ea320355ff4156f4ade7b/0_49_3904_2342/master/3904.jpg?width=300&quality=85&auto=format&fit=max&s=1e9b643d2c109a1e271f50046eac1324)](#img-1)

A blood moon last occurred in July 2018, though clouds largely obscured the celestial phenomenon in the UK. Photograph: JM F Almeida/Getty Images