The Russian Orthodox Church still uses the old Julian calendar, so Christmas celebrations take place 13 days after everyone else, on 7 January. If you're determined to celebrate the festive season twice, head there now. Picture: ALAMY
A Cuneiform clay tablet has been revealed to describe an asteroid impact which in 3123 BC hit Köfels, Austria, leaving in its wake a trail of destruction which may acccount for the biblical tale of Sodom and Gomorrah. The Planisphere clay tablet - inscribed around 700 BC - was unearthed in the remains of the library of the Assyrian royal palace at Nineveh. It's a copy of the night diary of a Sumerian astronomer containing drawings of constellations.